313261021 has 2 divisors, whose sum is σ = 313261022. Its totient is φ = 313261020.

The previous prime is 313261019. The next prime is 313261051. The reversal of 313261021 is 120162313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184688100 + 128572921 = 13590^2 + 11339^2 .

It is a cyclic number.

It is not a de Polignac number, because 313261021 - 2¹ = 313261019 is a prime.

Together with 313261019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 313261021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313261051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156630510 + 156630511.

It is an arithmetic number, because the mean of its divisors is an integer number (156630511).

Almost surely, 2^313261021 is an apocalyptic number.

It is an amenable number.

313261021 is a deficient number, since it is larger than the sum of its proper divisors (1).

313261021 is an equidigital number, since it uses as much as digits as its factorization.

313261021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 313261021 is about 17699.1813652496. The cubic root of 313261021 is about 679.1548186039.

The spelling of 313261021 in words is "three hundred thirteen million, two hundred sixty-one thousand, twenty-one".