642086631 has 12 divisors (see below), whose sum is σ = 932168952. Its totient is φ = 425883696.

The previous prime is 642086629. The next prime is 642086633. The reversal of 642086631 is 136680246.

642086631 is a `hidden beast` number, since 642 + 0 + 8 + 6 + 6 + 3 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (642086629) and next prime (642086633).

It is not a de Polignac number, because 642086631 - 2¹ = 642086629 is a prime.

It is a super-2 number, since 2×642086631² = 824550483417860322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642086633) 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 11 ways as a sum of consecutive naturals, for example, 179301 + ... + 182846.

It is an arithmetic number, because the mean of its divisors is an integer number (77680746).

Almost surely, 2^642086631 is an apocalyptic number.

642086631 is a deficient number, since it is larger than the sum of its proper divisors (290082321).

642086631 is a wasteful number, since it uses less digits than its factorization.

642086631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362350 (or 362347 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 642086631 is about 25339.4283873966. The cubic root of 642086631 is about 862.7094246336.

The spelling of 642086631 in words is "six hundred forty-two million, eighty-six thousand, six hundred thirty-one".