313072321 has 2 divisors, whose sum is σ = 313072322. Its totient is φ = 313072320.

The previous prime is 313072283. The next prime is 313072381. The reversal of 313072321 is 123270313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261792400 + 51279921 = 16180^2 + 7161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313072321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 313072292 and 313072301.

It is not a weakly prime, because it can be changed into another prime (313072381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156536160 + 156536161.

It is an arithmetic number, because the mean of its divisors is an integer number (156536161).

Almost surely, 2^313072321 is an apocalyptic number.

It is an amenable number.

313072321 is a deficient number, since it is larger than the sum of its proper divisors (1).

313072321 is an equidigital number, since it uses as much as digits as its factorization.

313072321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 313072321 is about 17693.8498072070. The cubic root of 313072321 is about 679.0184230243.

The spelling of 313072321 in words is "three hundred thirteen million, seventy-two thousand, three hundred twenty-one".