31992993 has 6 divisors (see below), whose sum is σ = 46212114. Its totient is φ = 21328656.

The previous prime is 31992971. The next prime is 31993001. The reversal of 31992993 is 39929913.

It can be written as a sum of positive squares in only one way, i.e., 29778849 + 2214144 = 5457^2 + 1488^2 .

It is not a de Polignac number, because 31992993 - 2²¹ = 29895841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31992923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1777380 + ... + 1777397.

It is an arithmetic number, because the mean of its divisors is an integer number (7702019).

Almost surely, 2^31992993 is an apocalyptic number.

It is an amenable number.

31992993 is a deficient number, since it is larger than the sum of its proper divisors (14219121).

31992993 is a wasteful number, since it uses less digits than its factorization.

31992993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3554783 (or 3554780 counting only the distinct ones).

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

The square root of 31992993 is about 5656.2348784328. The cubic root of 31992993 is about 317.4570359538.

The spelling of 31992993 in words is "thirty-one million, nine hundred ninety-two thousand, nine hundred ninety-three".