31313113212 has 48 divisors (see below), whose sum is σ = 78071605920. Its totient is φ = 9733588992.

The previous prime is 31313113163. The next prime is 31313113219. The reversal of 31313113212 is 21231131313.

It is a happy number.

It is a super-2 number, since 2×31313113212² (a number of 22 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313113219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 681873 + ... + 726344.

It is an arithmetic number, because the mean of its divisors is an integer number (1626491790).

Almost surely, 2^31313113212 is an apocalyptic number.

It is an amenable number.

31313113212 is an abundant number, since it is smaller than the sum of its proper divisors (46758492708).

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

31313113212 is a wasteful number, since it uses less digits than its factorization.

31313113212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408350 (or 1408348 counting only the distinct ones).

The product of its digits is 324, while the sum is 21.

Adding to 31313113212 its reverse (21231131313), we get a palindrome (52544244525).

The spelling of 31313113212 in words is "thirty-one billion, three hundred thirteen million, one hundred thirteen thousand, two hundred twelve".