31315424 has 24 divisors (see below), whose sum is σ = 70460208. Its totient is φ = 13420800.

The previous prime is 31315423. The next prime is 31315441. The reversal of 31315424 is 42451313.

It is a self number, because there is not a number n which added to its sum of digits gives 31315424.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31315423) 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, 69677 + ... + 70124.

It is an arithmetic number, because the mean of its divisors is an integer number (2935842).

Almost surely, 2^31315424 is an apocalyptic number.

It is an amenable number.

31315424 is an abundant number, since it is smaller than the sum of its proper divisors (39144784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31315424 is a wasteful number, since it uses less digits than its factorization.

31315424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139818 (or 139810 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 31315424 is about 5596.0185846725. The cubic root of 31315424 is about 315.1999201216.

Adding to 31315424 its reverse (42451313), we get a palindrome (73766737).

The spelling of 31315424 in words is "thirty-one million, three hundred fifteen thousand, four hundred twenty-four".