31312122133 has 8 divisors (see below), whose sum is σ = 31757932440. Its totient is φ = 30868400640.

The previous prime is 31312122109. The next prime is 31312122139. The reversal of 31312122133 is 33122121313.

It can be written as a sum of positive squares in 4 ways, for example, as 116791249 + 31195330884 = 10807^2 + 176622^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31312122133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312122139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491998 + ... + 551983.

It is an arithmetic number, because the mean of its divisors is an integer number (3969741555).

Almost surely, 2^31312122133 is an apocalyptic number.

It is an amenable number.

31312122133 is a deficient number, since it is larger than the sum of its proper divisors (445810307).

31312122133 is a wasteful number, since it uses less digits than its factorization.

31312122133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044407.

The product of its digits is 648, while the sum is 22.

Adding to 31312122133 its reverse (33122121313), we get a palindrome (64434243446).

The spelling of 31312122133 in words is "thirty-one billion, three hundred twelve million, one hundred twenty-two thousand, one hundred thirty-three".