31653993 has 16 divisors (see below), whose sum is σ = 49898880. Its totient is φ = 17463936.

The previous prime is 31653991. The next prime is 31653997. The reversal of 31653993 is 39935613.

It is not a de Polignac number, because 31653993 - 2¹ = 31653991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31653991) 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, 25380 + ... + 26597.

It is an arithmetic number, because the mean of its divisors is an integer number (3118680).

Almost surely, 2^31653993 is an apocalyptic number.

It is an amenable number.

31653993 is a deficient number, since it is larger than the sum of its proper divisors (18244887).

31653993 is a wasteful number, since it uses less digits than its factorization.

31653993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52016.

The product of its digits is 65610, while the sum is 39.

The square root of 31653993 is about 5626.1881411840. The cubic root of 31653993 is about 316.3317864575.

The spelling of 31653993 in words is "thirty-one million, six hundred fifty-three thousand, nine hundred ninety-three".