31231138 has 8 divisors (see below), whose sum is σ = 46986732. Its totient is φ = 15568896.

The previous prime is 31231133. The next prime is 31231139. The reversal of 31231138 is 83113213.

It can be written as a sum of positive squares in 2 ways, for example, as 30503529 + 727609 = 5523^2 + 853^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (31231133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22495 + ... + 23842.

Almost surely, 2^31231138 is an apocalyptic number.

31231138 is a deficient number, since it is larger than the sum of its proper divisors (15755594).

31231138 is a wasteful number, since it uses less digits than its factorization.

31231138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46676.

The product of its digits is 432, while the sum is 22.

The square root of 31231138 is about 5588.4826205331. The cubic root of 31231138 is about 314.9168773703.

The spelling of 31231138 in words is "thirty-one million, two hundred thirty-one thousand, one hundred thirty-eight".