87931794681 has 12 divisors (see below), whose sum is σ = 127015186480. Its totient is φ = 58619999160.

The previous prime is 87931794673. The next prime is 87931794689. The reversal of 87931794681 is 18649713978.

87931794681 is a `hidden beast` number, since 8 + 79 + 31 + 79 + 468 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (87931794673) and next prime (87931794689).

It is not a de Polignac number, because 87931794681 - 2³ = 87931794673 is a prime.

It is a super-2 number, since 2×87931794681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87931794689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 718926 + ... + 832296.

Almost surely, 2^87931794681 is an apocalyptic number.

It is an amenable number.

87931794681 is a deficient number, since it is larger than the sum of its proper divisors (39083391799).

87931794681 is a wasteful number, since it uses less digits than its factorization.

87931794681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199556 (or 199553 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 63.

The spelling of 87931794681 in words is "eighty-seven billion, nine hundred thirty-one million, seven hundred ninety-four thousand, six hundred eighty-one".