31123316 has 12 divisors (see below), whose sum is σ = 62246688. Its totient is φ = 13338552.

The previous prime is 31123303. The next prime is 31123319. The reversal of 31123316 is 61332113.

It is a happy number.

31123316 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123319) 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, 555746 + ... + 555801.

It is an arithmetic number, because the mean of its divisors is an integer number (5187224).

It is a self-describing number.

Almost surely, 2^31123316 is an apocalyptic number.

It is an amenable number.

31123316 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31123316 is a wasteful number, since it uses less digits than its factorization.

31123316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111558 (or 1111556 counting only the distinct ones).

The product of its digits is 324, while the sum is 20.

The square root of 31123316 is about 5578.8274753751. The cubic root of 31123316 is about 314.5540544519.

Adding to 31123316 its reverse (61332113), we get a palindrome (92455429).

The spelling of 31123316 in words is "thirty-one million, one hundred twenty-three thousand, three hundred sixteen".