31587838661 has 8 divisors (see below), whose sum is σ = 31991032320. Its totient is φ = 31184728848.

The previous prime is 31587838651. The next prime is 31587838663. The reversal of 31587838661 is 16683878513.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31587838661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31587838597 and 31587838606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31587838663) 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 7 ways as a sum of consecutive naturals, for example, 1153055 + ... + 1180131.

It is an arithmetic number, because the mean of its divisors is an integer number (3998879040).

Almost surely, 2^31587838661 is an apocalyptic number.

It is an amenable number.

31587838661 is a deficient number, since it is larger than the sum of its proper divisors (403193659).

31587838661 is a wasteful number, since it uses less digits than its factorization.

31587838661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41923.

The product of its digits is 5806080, while the sum is 56.

The spelling of 31587838661 in words is "thirty-one billion, five hundred eighty-seven million, eight hundred thirty-eight thousand, six hundred sixty-one".