401591657 has 4 divisors (see below), whose sum is σ = 422728080. Its totient is φ = 380455236.

The previous prime is 401591633. The next prime is 401591669. The reversal of 401591657 is 756195104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401591657 - 2²⁶ = 334482793 is a prime.

It is a super-2 number, since 2×401591657² = 322551717944011298, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 401591657.

It is not an unprimeable number, because it can be changed into a prime (401591677) 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, 10568183 + ... + 10568220.

It is an arithmetic number, because the mean of its divisors is an integer number (105682020).

Almost surely, 2^401591657 is an apocalyptic number.

It is an amenable number.

401591657 is a deficient number, since it is larger than the sum of its proper divisors (21136423).

401591657 is a wasteful number, since it uses less digits than its factorization.

401591657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21136422.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 401591657 is about 20039.7519196222. The cubic root of 401591657 is about 737.7822920868.

The spelling of 401591657 in words is "four hundred one million, five hundred ninety-one thousand, six hundred fifty-seven".