31253213 has 4 divisors (see below), whose sum is σ = 32330940. Its totient is φ = 30175488.

The previous prime is 31253203. The next prime is 31253219. The reversal of 31253213 is 31235213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31235213 = 47 ⋅664579.

It can be written as a sum of positive squares in 2 ways, for example, as 14303524 + 16949689 = 3782^2 + 4117^2 .

It is a cyclic number.

It is not a de Polignac number, because 31253213 - 2⁸ = 31252957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31253219) 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, 538820 + ... + 538877.

It is an arithmetic number, because the mean of its divisors is an integer number (8082735).

Almost surely, 2^31253213 is an apocalyptic number.

It is an amenable number.

31253213 is a deficient number, since it is larger than the sum of its proper divisors (1077727).

31253213 is a wasteful number, since it uses less digits than its factorization.

31253213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077726.

The product of its digits is 540, while the sum is 20.

The square root of 31253213 is about 5590.4573158195. The cubic root of 31253213 is about 314.9910571073.

Adding to 31253213 its reverse (31235213), we get a palindrome (62488426).

The spelling of 31253213 in words is "thirty-one million, two hundred fifty-three thousand, two hundred thirteen".