31379247 has 24 divisors (see below), whose sum is σ = 47361600. Its totient is φ = 19994688.

The previous prime is 31379239. The next prime is 31379261. The reversal of 31379247 is 74297313.

It is not a de Polignac number, because 31379247 - 2³ = 31379239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31379947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27898 + ... + 29000.

It is an arithmetic number, because the mean of its divisors is an integer number (1973400).

Almost surely, 2^31379247 is an apocalyptic number.

31379247 is a deficient number, since it is larger than the sum of its proper divisors (15982353).

31379247 is a wasteful number, since it uses less digits than its factorization.

31379247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247 (or 1244 counting only the distinct ones).

The product of its digits is 31752, while the sum is 36.

The square root of 31379247 is about 5601.7182185469. The cubic root of 31379247 is about 315.4139078926.

It can be divided in two parts, 31379 and 247, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 31379247 in words is "thirty-one million, three hundred seventy-nine thousand, two hundred forty-seven".