397367591 has 2 divisors, whose sum is σ = 397367592. Its totient is φ = 397367590.

The previous prime is 397367557. The next prime is 397367623. The reversal of 397367591 is 195763793.

It is a strong prime.

It is an emirp because it is prime and its reverse (195763793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397367591 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397363591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198683795 + 198683796.

It is an arithmetic number, because the mean of its divisors is an integer number (198683796).

Almost surely, 2^397367591 is an apocalyptic number.

397367591 is a deficient number, since it is larger than the sum of its proper divisors (1).

397367591 is an equidigital number, since it uses as much as digits as its factorization.

397367591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1071630, while the sum is 50.

The square root of 397367591 is about 19934.0811426060. The cubic root of 397367591 is about 735.1864280980.

The spelling of 397367591 in words is "three hundred ninety-seven million, three hundred sixty-seven thousand, five hundred ninety-one".