655523031 has 4 divisors (see below), whose sum is σ = 874030712. Its totient is φ = 437015352.

The previous prime is 655523021. The next prime is 655523039. The reversal of 655523031 is 130325556.

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

It is a de Polignac number, because none of the positive numbers 2^k-655523031 is a prime.

It is a super-2 number, since 2×655523031² = 859420888342853922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655523031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655523039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109253836 + ... + 109253841.

It is an arithmetic number, because the mean of its divisors is an integer number (218507678).

Almost surely, 2^655523031 is an apocalyptic number.

655523031 is a deficient number, since it is larger than the sum of its proper divisors (218507681).

655523031 is a wasteful number, since it uses less digits than its factorization.

655523031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218507680.

The product of its (nonzero) digits is 13500, while the sum is 30.

The square root of 655523031 is about 25603.1840012136. The cubic root of 655523031 is about 868.6856583924.

Adding to 655523031 its reverse (130325556), we get a palindrome (785848587).

The spelling of 655523031 in words is "six hundred fifty-five million, five hundred twenty-three thousand, thirty-one".