1313000121 has 4 divisors (see below), whose sum is σ = 1750666832. Its totient is φ = 875333412.

The previous prime is 1313000077. The next prime is 1313000123. The reversal of 1313000121 is 1210003131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1210003131 = 3 ⋅403334377.

It is not a de Polignac number, because 1313000121 - 2⁷ = 1312999993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1313000097 and 1313000106.

It is not an unprimeable number, because it can be changed into a prime (1313000123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218833351 + ... + 218833356.

It is an arithmetic number, because the mean of its divisors is an integer number (437666708).

Almost surely, 2^1313000121 is an apocalyptic number.

It is an amenable number.

1313000121 is a deficient number, since it is larger than the sum of its proper divisors (437666711).

1313000121 is an equidigital number, since it uses as much as digits as its factorization.

1313000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437666710.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 1313000121 is about 36235.3435336275. The cubic root of 1313000121 is about 1095.0188333117.

Adding to 1313000121 its reverse (1210003131), we get a palindrome (2523003252).

The spelling of 1313000121 in words is "one billion, three hundred thirteen million, one hundred twenty-one", and thus it is an aban number.