397109951 has 4 divisors (see below), whose sum is σ = 453839952. Its totient is φ = 340379952.

The previous prime is 397109903. The next prime is 397109959. The reversal of 397109951 is 159901793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 159901793 = 1493 ⋅107101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397109951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397109959) 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, 28364990 + ... + 28365003.

It is an arithmetic number, because the mean of its divisors is an integer number (113459988).

Almost surely, 2^397109951 is an apocalyptic number.

397109951 is a deficient number, since it is larger than the sum of its proper divisors (56730001).

397109951 is an equidigital number, since it uses as much as digits as its factorization.

397109951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56730000.

The product of its (nonzero) digits is 76545, while the sum is 44.

The square root of 397109951 is about 19927.6177954115. The cubic root of 397109951 is about 735.0275035599.

The spelling of 397109951 in words is "three hundred ninety-seven million, one hundred nine thousand, nine hundred fifty-one".