31688485 has 8 divisors (see below), whose sum is σ = 40027680. Its totient is φ = 24016464.

The previous prime is 31688483. The next prime is 31688491. The reversal of 31688485 is 58488613.

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

It is a cyclic number.

It is not a de Polignac number, because 31688485 - 2¹ = 31688483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31688483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166687 + ... + 166876.

It is an arithmetic number, because the mean of its divisors is an integer number (5003460).

Almost surely, 2^31688485 is an apocalyptic number.

It is an amenable number.

31688485 is a deficient number, since it is larger than the sum of its proper divisors (8339195).

31688485 is a wasteful number, since it uses less digits than its factorization.

31688485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333587.

The product of its digits is 184320, while the sum is 43.

The square root of 31688485 is about 5629.2526146905. The cubic root of 31688485 is about 316.4466424813.

It can be divided in two parts, 316884 and 85, that added together give a square (316969 = 563²).

The spelling of 31688485 in words is "thirty-one million, six hundred eighty-eight thousand, four hundred eighty-five".