31000133120 has 80 divisors (see below), whose sum is σ = 81084796848. Its totient is φ = 11272765440.

The previous prime is 31000133077. The next prime is 31000133123. The reversal of 31000133120 is 2133100013.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×31000133120² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31000133095 and 31000133104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000133123) 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, 522269 + ... + 578588.

Almost surely, 2^31000133120 is an apocalyptic number.

It is an amenable number.

31000133120 is an abundant number, since it is smaller than the sum of its proper divisors (50084663728).

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

31000133120 is a wasteful number, since it uses less digits than its factorization.

31000133120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100891 (or 1100875 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 31000133120 its reverse (2133100013), we get a palindrome (33133233133).

The spelling of 31000133120 in words is "thirty-one billion, one hundred thirty-three thousand, one hundred twenty".