31307138 has 8 divisors (see below), whose sum is σ = 47445132. Its totient is φ = 15492096.

The previous prime is 31307119. The next prime is 31307141. The reversal of 31307138 is 83170313.

It can be written as a sum of positive squares in 2 ways, for example, as 28440889 + 2866249 = 5333^2 + 1693^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80495 + ... + 80882.

Almost surely, 2^31307138 is an apocalyptic number.

31307138 is a deficient number, since it is larger than the sum of its proper divisors (16137994).

31307138 is a wasteful number, since it uses less digits than its factorization.

31307138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161476.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 31307138 is about 5595.2781879009. The cubic root of 31307138 is about 315.1721172416.

The spelling of 31307138 in words is "thirty-one million, three hundred seven thousand, one hundred thirty-eight".