31601986 has 12 divisors (see below), whose sum is σ = 51330402. Its totient is φ = 14585376.

The previous prime is 31601923. The next prime is 31601987. The reversal of 31601986 is 68910613.

It can be written as a sum of positive squares in 3 ways, for example, as 21483225 + 10118761 = 4635^2 + 3181^2 .

It is not an unprimeable number, because it can be changed into a prime (31601987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46411 + ... + 47086.

Almost surely, 2^31601986 is an apocalyptic number.

31601986 is a deficient number, since it is larger than the sum of its proper divisors (19728416).

31601986 is a wasteful number, since it uses less digits than its factorization.

31601986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93525 (or 93512 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 31601986 is about 5621.5643730193. The cubic root of 31601986 is about 316.1584488180.

The spelling of 31601986 in words is "thirty-one million, six hundred one thousand, nine hundred eighty-six".