320131397 has 2 divisors, whose sum is σ = 320131398. Its totient is φ = 320131396.

The previous prime is 320131391. The next prime is 320131421. The reversal of 320131397 is 793131023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236975236 + 83156161 = 15394^2 + 9119^2 .

It is a cyclic number.

It is not a de Polignac number, because 320131397 - 2⁶ = 320131333 is a prime.

It is a super-2 number, since 2×320131397² = 204968222690343218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320131391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160065698 + 160065699.

It is an arithmetic number, because the mean of its divisors is an integer number (160065699).

Almost surely, 2^320131397 is an apocalyptic number.

It is an amenable number.

320131397 is a deficient number, since it is larger than the sum of its proper divisors (1).

320131397 is an equidigital number, since it uses as much as digits as its factorization.

320131397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 29.

The square root of 320131397 is about 17892.2161008635. The cubic root of 320131397 is about 684.0839849054.

The spelling of 320131397 in words is "three hundred twenty million, one hundred thirty-one thousand, three hundred ninety-seven".