397631351 has 4 divisors (see below), whose sum is σ = 428218392. Its totient is φ = 367044312.

The previous prime is 397631303. The next prime is 397631369. The reversal of 397631351 is 153136793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 153136793 = 9767 ⋅15679.

It is a cyclic number.

It is not a de Polignac number, because 397631351 - 2⁶ = 397631287 is a prime.

It is a super-2 number, since 2×397631351² = 316221382596170402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397631371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15293501 + ... + 15293526.

It is an arithmetic number, because the mean of its divisors is an integer number (107054598).

Almost surely, 2^397631351 is an apocalyptic number.

397631351 is a deficient number, since it is larger than the sum of its proper divisors (30587041).

397631351 is a wasteful number, since it uses less digits than its factorization.

397631351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30587040.

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

The square root of 397631351 is about 19940.6958504461. The cubic root of 397631351 is about 735.3490565963.

It can be divided in two parts, 39763 and 1351, that added together give a palindrome (41114).

The spelling of 397631351 in words is "three hundred ninety-seven million, six hundred thirty-one thousand, three hundred fifty-one".