397361531 has 6 divisors (see below), whose sum is σ = 462236940. Its totient is φ = 340595556.

The previous prime is 397361507. The next prime is 397361533. The reversal of 397361531 is 135163793.

It is not a de Polignac number, because 397361531 - 2¹⁸ = 397099387 is a prime.

It is a super-2 number, since 2×397361531² = 315792372637327922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397361533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4054661 + ... + 4054758.

It is an arithmetic number, because the mean of its divisors is an integer number (77039490).

Almost surely, 2^397361531 is an apocalyptic number.

397361531 is a deficient number, since it is larger than the sum of its proper divisors (64875409).

397361531 is an equidigital number, since it uses as much as digits as its factorization.

397361531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8109433 (or 8109426 counting only the distinct ones).

The product of its digits is 51030, while the sum is 38.

The square root of 397361531 is about 19933.9291410399. The cubic root of 397361531 is about 735.1826907924.

The spelling of 397361531 in words is "three hundred ninety-seven million, three hundred sixty-one thousand, five hundred thirty-one".