31485993 has 16 divisors (see below), whose sum is σ = 52340736. Its totient is φ = 16356240.

The previous prime is 31485973. The next prime is 31486009. The reversal of 31485993 is 39958413.

It is not a de Polignac number, because 31485993 - 2⁸ = 31485737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31485953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67921 + ... + 68382.

It is an arithmetic number, because the mean of its divisors is an integer number (3271296).

Almost surely, 2^31485993 is an apocalyptic number.

31485993 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

31485993 is a deficient number, since it is larger than the sum of its proper divisors (20854743).

31485993 is a wasteful number, since it uses less digits than its factorization.

31485993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136324.

The product of its digits is 116640, while the sum is 42.

The square root of 31485993 is about 5611.2380986731. The cubic root of 31485993 is about 315.7711616998.

The spelling of 31485993 in words is "thirty-one million, four hundred eighty-five thousand, nine hundred ninety-three".