655931 has 4 divisors (see below), whose sum is σ = 657552. Its totient is φ = 654312.

The previous prime is 655927. The next prime is 655943. The reversal of 655931 is 139556.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 655931 - 2² = 655927 is a prime.

It is a super-2 number, since 2×655931² = 860490953522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 655894 and 655903.

It is not an unprimeable number, because it can be changed into a prime (655901) 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, 386 + ... + 1208.

It is an arithmetic number, because the mean of its divisors is an integer number (164388).

2⁶⁵⁵⁹³¹ is an apocalyptic number.

655931 is a deficient number, since it is larger than the sum of its proper divisors (1621).

655931 is an equidigital number, since it uses as much as digits as its factorization.

655931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620.

The product of its digits is 4050, while the sum is 29.

The square root of 655931 is about 809.8956722937. The cubic root of 655931 is about 86.8865831734.

The spelling of 655931 in words is "six hundred fifty-five thousand, nine hundred thirty-one".