16431057 has 6 divisors (see below), whose sum is σ = 23733762. Its totient is φ = 10954032.

The previous prime is 16431053. The next prime is 16431097. The reversal of 16431057 is 75013461.

16431057 is a `hidden beast` number, since 1 + 643 + 10 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15492096 + 938961 = 3936^2 + 969^2 .

It is not a de Polignac number, because 16431057 - 2² = 16431053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16431057.

It is not an unprimeable number, because it can be changed into a prime (16431053) 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, 912828 + ... + 912845.

It is an arithmetic number, because the mean of its divisors is an integer number (3955627).

Almost surely, 2^16431057 is an apocalyptic number.

It is an amenable number.

16431057 is a deficient number, since it is larger than the sum of its proper divisors (7302705).

16431057 is a wasteful number, since it uses less digits than its factorization.

16431057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825679 (or 1825676 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 16431057 is about 4053.5240223786. The cubic root of 16431057 is about 254.2270945217.

The spelling of 16431057 in words is "sixteen million, four hundred thirty-one thousand, fifty-seven".