655631587 has 4 divisors (see below), whose sum is σ = 706064800. Its totient is φ = 605198376.

The previous prime is 655631573. The next prime is 655631593. The reversal of 655631587 is 785136556.

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-655631587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655631087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25216587 + ... + 25216612.

It is an arithmetic number, because the mean of its divisors is an integer number (176516200).

Almost surely, 2^655631587 is an apocalyptic number.

655631587 is a deficient number, since it is larger than the sum of its proper divisors (50433213).

655631587 is a wasteful number, since it uses less digits than its factorization.

655631587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50433212.

The product of its digits is 756000, while the sum is 46.

The square root of 655631587 is about 25605.3038841565. The cubic root of 655631587 is about 868.7336078062.

The spelling of 655631587 in words is "six hundred fifty-five million, six hundred thirty-one thousand, five hundred eighty-seven".