656997 has 16 divisors (see below), whose sum is σ = 979968. Its totient is φ = 388080.

The previous prime is 656993. The next prime is 657017. The reversal of 656997 is 799656.

656997 is nontrivially palindromic in base 15.

It is not a de Polignac number, because 656997 - 2² = 656993 is a prime.

It is an Ulam number.

656997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1188 + ... + 1650.

It is an arithmetic number, because the mean of its divisors is an integer number (61248).

2⁶⁵⁶⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

656997 is a deficient number, since it is larger than the sum of its proper divisors (322971).

656997 is a wasteful number, since it uses less digits than its factorization.

656997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520.

The product of its digits is 102060, while the sum is 42.

The square root of 656997 is about 810.5535145812. The cubic root of 656997 is about 86.9336262149.

It can be divided in two parts, 6569 and 97, that added together give a palindrome (6666).

The spelling of 656997 in words is "six hundred fifty-six thousand, nine hundred ninety-seven".