655285931 has 4 divisors (see below), whose sum is σ = 657111600. Its totient is φ = 653460264.

The previous prime is 655285861. The next prime is 655285937. The reversal of 655285931 is 139582556.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655285931 is a prime.

It is a super-2 number, since 2×655285931² = 858799302733073522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655285937) 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, 912296 + ... + 913013.

It is an arithmetic number, because the mean of its divisors is an integer number (164277900).

Almost surely, 2^655285931 is an apocalyptic number.

655285931 is a deficient number, since it is larger than the sum of its proper divisors (1825669).

655285931 is a wasteful number, since it uses less digits than its factorization.

655285931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825668.

The product of its digits is 324000, while the sum is 44.

The square root of 655285931 is about 25598.5532989659. The cubic root of 655285931 is about 868.5809124124.

The spelling of 655285931 in words is "six hundred fifty-five million, two hundred eighty-five thousand, nine hundred thirty-one".