31252971 has 4 divisors (see below), whose sum is σ = 41670632. Its totient is φ = 20835312.

The previous prime is 31252961. The next prime is 31253009. The reversal of 31252971 is 17925213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17925213 = 3 ⋅5975071.

It is not a de Polignac number, because 31252971 - 2⁵ = 31252939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31252931) 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, 5208826 + ... + 5208831.

It is an arithmetic number, because the mean of its divisors is an integer number (10417658).

Almost surely, 2^31252971 is an apocalyptic number.

31252971 is a deficient number, since it is larger than the sum of its proper divisors (10417661).

31252971 is a wasteful number, since it uses less digits than its factorization.

31252971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10417660.

The product of its digits is 3780, while the sum is 30.

The square root of 31252971 is about 5590.4356717522. The cubic root of 31252971 is about 314.9902440919.

It can be divided in two parts, 31252 and 971, that added together give a palindrome (32223).

The spelling of 31252971 in words is "thirty-one million, two hundred fifty-two thousand, nine hundred seventy-one".