31212316 has 24 divisors (see below), whose sum is σ = 56652624. Its totient is φ = 15035520.

The previous prime is 31212301. The next prime is 31212341. The reversal of 31212316 is 61321213.

It is a junction number, because it is equal to n+sod(n) for n = 31212293 and 31212302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12466 + ... + 14758.

It is an arithmetic number, because the mean of its divisors is an integer number (2360526).

Almost surely, 2^31212316 is an apocalyptic number.

It is an amenable number.

31212316 is a deficient number, since it is larger than the sum of its proper divisors (25440308).

31212316 is a wasteful number, since it uses less digits than its factorization.

31212316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421 (or 2419 counting only the distinct ones).

The product of its digits is 216, while the sum is 19.

The square root of 31212316 is about 5586.7983675805. The cubic root of 31212316 is about 314.8536012407.

Adding to 31212316 its reverse (61321213), we get a palindrome (92533529).

The spelling of 31212316 in words is "thirty-one million, two hundred twelve thousand, three hundred sixteen".