31315253 has 4 divisors (see below), whose sum is σ = 31846080. Its totient is φ = 30784428.

The previous prime is 31315247. The next prime is 31315261. The reversal of 31315253 is 35251313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35251313 = 67 ⋅526139.

It is a cyclic number.

It is not a de Polignac number, because 31315253 - 2¹² = 31311157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311253) 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, 265325 + ... + 265442.

It is an arithmetic number, because the mean of its divisors is an integer number (7961520).

Almost surely, 2^31315253 is an apocalyptic number.

It is an amenable number.

31315253 is a deficient number, since it is larger than the sum of its proper divisors (530827).

31315253 is an equidigital number, since it uses as much as digits as its factorization.

31315253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530826.

The product of its digits is 1350, while the sum is 23.

The square root of 31315253 is about 5596.0033059318. The cubic root of 31315253 is about 315.1993463970.

Adding to 31315253 its reverse (35251313), we get a palindrome (66566566).

The spelling of 31315253 in words is "thirty-one million, three hundred fifteen thousand, two hundred fifty-three".