397087231 has 2 divisors, whose sum is σ = 397087232. Its totient is φ = 397087230.

The previous prime is 397087199. The next prime is 397087237. The reversal of 397087231 is 132780793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397087231 - 2⁵ = 397087199 is a prime.

It is a super-2 number, since 2×397087231² = 315356538046494722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397087237) 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 as a sum of consecutive naturals, namely, 198543615 + 198543616.

It is an arithmetic number, because the mean of its divisors is an integer number (198543616).

Almost surely, 2^397087231 is an apocalyptic number.

397087231 is a deficient number, since it is larger than the sum of its proper divisors (1).

397087231 is an equidigital number, since it uses as much as digits as its factorization.

397087231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 397087231 is about 19927.0477241362. The cubic root of 397087231 is about 735.0134854915.

The spelling of 397087231 in words is "three hundred ninety-seven million, eighty-seven thousand, two hundred thirty-one".