31123172 has 12 divisors (see below), whose sum is σ = 54507516. Its totient is φ = 15549600.

The previous prime is 31123151. The next prime is 31123181. The reversal of 31123172 is 27132113.

It can be written as a sum of positive squares in 2 ways, for example, as 7054336 + 24068836 = 2656^2 + 4906^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5558 + ... + 9650.

It is an arithmetic number, because the mean of its divisors is an integer number (4542293).

Almost surely, 2^31123172 is an apocalyptic number.

It is an amenable number.

31123172 is a deficient number, since it is larger than the sum of its proper divisors (23384344).

31123172 is a wasteful number, since it uses less digits than its factorization.

31123172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5998 (or 5996 counting only the distinct ones).

The product of its digits is 252, while the sum is 20.

The square root of 31123172 is about 5578.8145694224. The cubic root of 31123172 is about 314.5535693295.

Adding to 31123172 its reverse (27132113), we get a palindrome (58255285).

The spelling of 31123172 in words is "thirty-one million, one hundred twenty-three thousand, one hundred seventy-two".