31660993 has 16 divisors (see below), whose sum is σ = 39634560. Its totient is φ = 24621696.

The previous prime is 31660991. The next prime is 31660999. The reversal of 31660993 is 39906613.

It is a cyclic number.

It is not a de Polignac number, because 31660993 - 2¹ = 31660991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31660991) 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 15 ways as a sum of consecutive naturals, for example, 2421 + ... + 8317.

It is an arithmetic number, because the mean of its divisors is an integer number (2477160).

Almost surely, 2^31660993 is an apocalyptic number.

It is an amenable number.

31660993 is a deficient number, since it is larger than the sum of its proper divisors (7973567).

31660993 is a wasteful number, since it uses less digits than its factorization.

31660993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5976.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 31660993 is about 5626.8101976164. The cubic root of 31660993 is about 316.3551027292.

The spelling of 31660993 in words is "thirty-one million, six hundred sixty thousand, nine hundred ninety-three".