87631810513 has 4 divisors (see below), whose sum is σ = 94372719028. Its totient is φ = 80890902000.

The previous prime is 87631810459. The next prime is 87631810517. The reversal of 87631810513 is 31501813678.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4752309969 + 82879500544 = 68937^2 + 287888^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87631810513 is a prime.

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 87631810513.

It is not an unprimeable number, because it can be changed into a prime (87631810517) 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 3 ways as a sum of consecutive naturals, for example, 3370454238 + ... + 3370454263.

It is an arithmetic number, because the mean of its divisors is an integer number (23593179757).

Almost surely, 2^87631810513 is an apocalyptic number.

It is an amenable number.

87631810513 is a deficient number, since it is larger than the sum of its proper divisors (6740908515).

87631810513 is a wasteful number, since it uses less digits than its factorization.

87631810513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6740908514.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 87631810513 in words is "eighty-seven billion, six hundred thirty-one million, eight hundred ten thousand, five hundred thirteen".