31000131212 has 12 divisors (see below), whose sum is σ = 55511863176. Its totient is φ = 15139598880.

The previous prime is 31000131203. The next prime is 31000131221. The reversal of 31000131212 is 21213100013.

It is an interprime number because it is at equal distance from previous prime (31000131203) and next prime (31000131221).

It is a super-2 number, since 2×31000131212² (a number of 22 digits) contains 22 as substring.

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, 90116489 + ... + 90116832.

It is an arithmetic number, because the mean of its divisors is an integer number (4625988598).

Almost surely, 2^31000131212 is an apocalyptic number.

It is an amenable number.

31000131212 is a deficient number, since it is larger than the sum of its proper divisors (24511731964).

31000131212 is a wasteful number, since it uses less digits than its factorization.

31000131212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180233368 (or 180233366 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31000131212 its reverse (21213100013), we get a palindrome (52213231225).

The spelling of 31000131212 in words is "thirty-one billion, one hundred thirty-one thousand, two hundred twelve".