31213425 has 48 divisors (see below), whose sum is σ = 54282240. Its totient is φ = 15805440.

The previous prime is 31213417. The next prime is 31213433. The reversal of 31213425 is 52431213.

It is an interprime number because it is at equal distance from previous prime (31213417) and next prime (31213433).

It is not a de Polignac number, because 31213425 - 2³ = 31213417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 245712 + ... + 245838.

It is an arithmetic number, because the mean of its divisors is an integer number (1130880).

Almost surely, 2^31213425 is an apocalyptic number.

It is an amenable number.

31213425 is a deficient number, since it is larger than the sum of its proper divisors (23068815).

31213425 is a wasteful number, since it uses less digits than its factorization.

31213425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 277 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 31213425 is about 5586.8976185357. The cubic root of 31213425 is about 314.8573302015.

Adding to 31213425 its reverse (52431213), we get a palindrome (83644638).

The spelling of 31213425 in words is "thirty-one million, two hundred thirteen thousand, four hundred twenty-five".