31990653 has 8 divisors (see below), whose sum is σ = 47393600. Its totient is φ = 21327084.

The previous prime is 31990649. The next prime is 31990669. The reversal of 31990653 is 35609913.

It is not a de Polignac number, because 31990653 - 2² = 31990649 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31991653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 592393 + ... + 592446.

It is an arithmetic number, because the mean of its divisors is an integer number (5924200).

Almost surely, 2^31990653 is an apocalyptic number.

It is an amenable number.

31990653 is a deficient number, since it is larger than the sum of its proper divisors (15402947).

31990653 is a wasteful number, since it uses less digits than its factorization.

31990653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184848 (or 1184842 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 36.

The square root of 31990653 is about 5656.0280232686. The cubic root of 31990653 is about 317.4492960551.

The spelling of 31990653 in words is "thirty-one million, nine hundred ninety thousand, six hundred fifty-three".