31686342237 has 96 divisors (see below), whose sum is σ = 54481481600. Its totient is φ = 18137053440.

The previous prime is 31686342221. The next prime is 31686342257. The reversal of 31686342237 is 73224368613.

31686342237 is a `hidden beast` number, since 3 + 1 + 6 + 8 + 634 + 2 + 2 + 3 + 7 = 666.

It is not a de Polignac number, because 31686342237 - 2⁴ = 31686342221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31686342192 and 31686342201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31686342257) 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 95 ways as a sum of consecutive naturals, for example, 28366803 + ... + 28367919.

Almost surely, 2^31686342237 is an apocalyptic number.

It is an amenable number.

31686342237 is a deficient number, since it is larger than the sum of its proper divisors (22795139363).

31686342237 is a wasteful number, since it uses less digits than its factorization.

31686342237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624 (or 1607 counting only the distinct ones).

The product of its digits is 870912, while the sum is 45.

The spelling of 31686342237 in words is "thirty-one billion, six hundred eighty-six million, three hundred forty-two thousand, two hundred thirty-seven".