656542 has 4 divisors (see below), whose sum is σ = 984816. Its totient is φ = 328270.

The previous prime is 656527. The next prime is 656561. The reversal of 656542 is 245656.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 656542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164134 + ... + 164137.

It is an arithmetic number, because the mean of its divisors is an integer number (246204).

2⁶⁵⁶⁵⁴² is an apocalyptic number.

656542 is a deficient number, since it is larger than the sum of its proper divisors (328274).

656542 is a wasteful number, since it uses less digits than its factorization.

656542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328273.

The product of its digits is 7200, while the sum is 28.

The square root of 656542 is about 810.2727935702. The cubic root of 656542 is about 86.9135530971.

It can be divided in two parts, 65654 and 2, that added together give a palindrome (65656).

The spelling of 656542 in words is "six hundred fifty-six thousand, five hundred forty-two".