31197980213 has 4 divisors (see below), whose sum is σ = 31200300768. Its totient is φ = 31195659660.

The previous prime is 31197980179. The next prime is 31197980243. The reversal of 31197980213 is 31208979113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31197980213 - 2¹⁴ = 31197963829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31197980243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1139993 + ... + 1167038.

It is an arithmetic number, because the mean of its divisors is an integer number (7800075192).

Almost surely, 2^31197980213 is an apocalyptic number.

It is an amenable number.

31197980213 is a deficient number, since it is larger than the sum of its proper divisors (2320555).

31197980213 is a wasteful number, since it uses less digits than its factorization.

31197980213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320554.

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 31197980213 in words is "thirty-one billion, one hundred ninety-seven million, nine hundred eighty thousand, two hundred thirteen".