31689213396 has 24 divisors (see below), whose sum is σ = 74099844000. Its totient is φ = 10540450272.

The previous prime is 31689213371. The next prime is 31689213397. The reversal of 31689213396 is 69331298613.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31689213397) 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, 2821771 + ... + 2832978.

It is an arithmetic number, because the mean of its divisors is an integer number (3087493500).

Almost surely, 2^31689213396 is an apocalyptic number.

It is an amenable number.

31689213396 is an abundant number, since it is smaller than the sum of its proper divisors (42410630604).

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

31689213396 is a wasteful number, since it uses less digits than its factorization.

31689213396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5655223 (or 5655221 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 51.

The spelling of 31689213396 in words is "thirty-one billion, six hundred eighty-nine million, two hundred thirteen thousand, three hundred ninety-six".