31138893 has 12 divisors (see below), whose sum is σ = 45029088. Its totient is φ = 20735880.

The previous prime is 31138889. The next prime is 31138903. The reversal of 31138893 is 39883113.

It is not a de Polignac number, because 31138893 - 2² = 31138889 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31138873) 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 11 ways as a sum of consecutive naturals, for example, 11038 + ... + 13568.

It is an arithmetic number, because the mean of its divisors is an integer number (3752424).

Almost surely, 2^31138893 is an apocalyptic number.

It is an amenable number.

31138893 is a deficient number, since it is larger than the sum of its proper divisors (13890195).

31138893 is a wasteful number, since it uses less digits than its factorization.

31138893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3904 (or 3901 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 31138893 is about 5580.2233826255. The cubic root of 31138893 is about 314.6065230609.

It can be divided in two parts, 311 and 38893, that added together give a square (39204 = 198²).

The spelling of 31138893 in words is "thirty-one million, one hundred thirty-eight thousand, eight hundred ninety-three".