31299993 has 8 divisors (see below), whose sum is σ = 46370400. Its totient is φ = 20866644.

The previous prime is 31299971. The next prime is 31299997. The reversal of 31299993 is 39999213.

It is a de Polignac number, because none of the positive numbers 2^k-31299993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31299997) 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, 579603 + ... + 579656.

It is an arithmetic number, because the mean of its divisors is an integer number (5796300).

Almost surely, 2^31299993 is an apocalyptic number.

It is an amenable number.

31299993 is a deficient number, since it is larger than the sum of its proper divisors (15070407).

31299993 is a wasteful number, since it uses less digits than its factorization.

31299993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159268 (or 1159262 counting only the distinct ones).

The product of its digits is 118098, while the sum is 45.

The square root of 31299993 is about 5594.6396666810. The cubic root of 31299993 is about 315.1481389387.

The spelling of 31299993 in words is "thirty-one million, two hundred ninety-nine thousand, nine hundred ninety-three".