1301221231 has 4 divisors (see below), whose sum is σ = 1301296464. Its totient is φ = 1301146000.

The previous prime is 1301221211. The next prime is 1301221241. The reversal of 1301221231 is 1321221031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1301221231 - 2¹⁷ = 1301090159 is a prime.

It is a super-2 number, since 2×1301221231² = 3386353384010310722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1301221211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2811 + ... + 51091.

It is an arithmetic number, because the mean of its divisors is an integer number (325324116).

Almost surely, 2^1301221231 is an apocalyptic number.

1301221231 is a deficient number, since it is larger than the sum of its proper divisors (75233).

1301221231 is an equidigital number, since it uses as much as digits as its factorization.

1301221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75232.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1301221231 is about 36072.4442060695. Note that the first 3 decimals coincide. The cubic root of 1301221231 is about 1091.7345306709.

Adding to 1301221231 its reverse (1321221031), we get a palindrome (2622442262).

It can be divided in two parts, 13012 and 21231, that added together give a palindrome (34243).

The spelling of 1301221231 in words is "one billion, three hundred one million, two hundred twenty-one thousand, two hundred thirty-one".