31131093 has 16 divisors (see below), whose sum is σ = 47689856. Its totient is φ = 17694720.

The previous prime is 31131091. The next prime is 31131119. The reversal of 31131093 is 39013113.

It is not a de Polignac number, because 31131093 - 2¹ = 31131091 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213 + ... + 7893.

It is an arithmetic number, because the mean of its divisors is an integer number (2980616).

Almost surely, 2^31131093 is an apocalyptic number.

It is an amenable number.

31131093 is a deficient number, since it is larger than the sum of its proper divisors (16558763).

31131093 is a wasteful number, since it uses less digits than its factorization.

31131093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7884.

The product of its (nonzero) digits is 243, while the sum is 21.

The square root of 31131093 is about 5579.5244421008. The cubic root of 31131093 is about 314.5802522083.

The spelling of 31131093 in words is "thirty-one million, one hundred thirty-one thousand, ninety-three".