31551133412 has 12 divisors (see below), whose sum is σ = 56256266556. Its totient is φ = 15477914400.

The previous prime is 31551133403. The next prime is 31551133489. The reversal of 31551133412 is 21433115513.

It can be written as a sum of positive squares in 2 ways, for example, as 19890589156 + 11660544256 = 141034^2 + 107984^2 .

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, 74412839 + ... + 74413262.

It is an arithmetic number, because the mean of its divisors is an integer number (4688022213).

Almost surely, 2^31551133412 is an apocalyptic number.

It is an amenable number.

31551133412 is a deficient number, since it is larger than the sum of its proper divisors (24705133144).

31551133412 is a wasteful number, since it uses less digits than its factorization.

31551133412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148826158 (or 148826156 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

Adding to 31551133412 its reverse (21433115513), we get a palindrome (52984248925).

The spelling of 31551133412 in words is "thirty-one billion, five hundred fifty-one million, one hundred thirty-three thousand, four hundred twelve".