31247485 has 4 divisors (see below), whose sum is σ = 37496988. Its totient is φ = 24997984.

The previous prime is 31247477. The next prime is 31247507. The reversal of 31247485 is 58474213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58474213 = 7 ⋅8353459.

It can be written as a sum of positive squares in 2 ways, for example, as 14584761 + 16662724 = 3819^2 + 4082^2 .

It is a cyclic number.

It is not a de Polignac number, because 31247485 - 2³ = 31247477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31247485.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3124744 + ... + 3124753.

It is an arithmetic number, because the mean of its divisors is an integer number (9374247).

Almost surely, 2^31247485 is an apocalyptic number.

It is an amenable number.

31247485 is a deficient number, since it is larger than the sum of its proper divisors (6249503).

31247485 is an equidigital number, since it uses as much as digits as its factorization.

31247485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6249502.

The product of its digits is 26880, while the sum is 34.

The square root of 31247485 is about 5589.9449907848. The cubic root of 31247485 is about 314.9718123765.

It can be divided in two parts, 3124 and 7485, that added together give a square (10609 = 103²).

The spelling of 31247485 in words is "thirty-one million, two hundred forty-seven thousand, four hundred eighty-five".