1221000313 has 4 divisors (see below), whose sum is σ = 1314923428. Its totient is φ = 1127077200.

The previous prime is 1221000283. The next prime is 1221000323. The reversal of 1221000313 is 3130001221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3130001221 = 11969 ⋅261509.

It can be written as a sum of positive squares in 2 ways, for example, as 107910544 + 1113089769 = 10388^2 + 33363^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221000313 - 2²⁵ = 1187445881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 93923101 = 1221000313 / (1 + 2 + 2 + 1 + 0 + 0 + 0 + 3 + 1 + 3).

It is a junction number, because it is equal to n+sod(n) for n = 1221000293 and 1221000302.

It is not an unprimeable number, because it can be changed into a prime (1221000323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46961538 + ... + 46961563.

It is an arithmetic number, because the mean of its divisors is an integer number (328730857).

Almost surely, 2^1221000313 is an apocalyptic number.

1221000313 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1221000313 is a deficient number, since it is larger than the sum of its proper divisors (93923115).

1221000313 is an equidigital number, since it uses as much as digits as its factorization.

1221000313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93923114.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1221000313 is about 34942.8148980588. The cubic root of 1221000313 is about 1068.8216897615.

Adding to 1221000313 its reverse (3130001221), we get a palindrome (4351001534).

The spelling of 1221000313 in words is "one billion, two hundred twenty-one million, three hundred thirteen", and thus it is an aban number.