31253117 has 4 divisors (see below), whose sum is σ = 35717856. Its totient is φ = 26788380.

The previous prime is 31253083. The next prime is 31253141. The reversal of 31253117 is 71135213.

31253117 is nontrivially palindromic in base 15.

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: 71135213 = 5419 ⋅13127.

It is a cyclic number.

It is not a de Polignac number, because 31253117 - 2⁸ = 31252861 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31253092 and 31253101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31253017) 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, 2232359 + ... + 2232372.

It is an arithmetic number, because the mean of its divisors is an integer number (8929464).

Almost surely, 2^31253117 is an apocalyptic number.

It is an amenable number.

31253117 is a deficient number, since it is larger than the sum of its proper divisors (4464739).

31253117 is an equidigital number, since it uses as much as digits as its factorization.

31253117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4464738.

The product of its digits is 630, while the sum is 23.

The square root of 31253117 is about 5590.4487297533. The cubic root of 31253117 is about 314.9907345893.

The spelling of 31253117 in words is "thirty-one million, two hundred fifty-three thousand, one hundred seventeen".