31123133320 has 16 divisors (see below), whose sum is σ = 70027050060. Its totient is φ = 12449253312.

The previous prime is 31123133317. The next prime is 31123133339. The reversal of 31123133320 is 2333132113.

It can be written as a sum of positive squares in 2 ways, for example, as 28921083844 + 2202049476 = 170062^2 + 46926^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31123133291 and 31123133300.

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, 389039127 + ... + 389039206.

Almost surely, 2^31123133320 is an apocalyptic number.

It is an amenable number.

31123133320 is an abundant number, since it is smaller than the sum of its proper divisors (38903916740).

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

31123133320 is a wasteful number, since it uses less digits than its factorization.

31123133320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778078344 (or 778078340 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31123133320 its reverse (2333132113), we get a palindrome (33456265433).

The spelling of 31123133320 in words is "thirty-one billion, one hundred twenty-three million, one hundred thirty-three thousand, three hundred twenty".