31216425 has 12 divisors (see below), whose sum is σ = 51611280. Its totient is φ = 16648720.

The previous prime is 31216397. The next prime is 31216447. The reversal of 31216425 is 52461213.

It is not a de Polignac number, because 31216425 - 2⁸ = 31216169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31216395 and 31216404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 208035 + ... + 208184.

It is an arithmetic number, because the mean of its divisors is an integer number (4300940).

Almost surely, 2^31216425 is an apocalyptic number.

It is an amenable number.

31216425 is a deficient number, since it is larger than the sum of its proper divisors (20394855).

31216425 is a wasteful number, since it uses less digits than its factorization.

31216425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416232 (or 416227 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 31216425 is about 5587.1660974057. The cubic root of 31216425 is about 314.8674171190.

Adding to 31216425 its reverse (52461213), we get a palindrome (83677638).

The spelling of 31216425 in words is "thirty-one million, two hundred sixteen thousand, four hundred twenty-five".