31313200023191 has 4 divisors (see below), whose sum is σ = 31590307988112. Its totient is φ = 31036092058272.

The previous prime is 31313200023151. The next prime is 31313200023221. The reversal of 31313200023191 is 19132000231313.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31313200023191 - 2¹⁸ = 31313199761047 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 (31313200023151) 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, 138553982291 + ... + 138553982516.

It is an arithmetic number, because the mean of its divisors is an integer number (7897576997028).

Almost surely, 2^{31313200023191} is an apocalyptic number.

31313200023191 is a deficient number, since it is larger than the sum of its proper divisors (277107964921).

31313200023191 is a wasteful number, since it uses less digits than its factorization.

31313200023191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277107964920.

The product of its (nonzero) digits is 2916, while the sum is 29.

The spelling of 31313200023191 in words is "thirty-one trillion, three hundred thirteen billion, two hundred million, twenty-three thousand, one hundred ninety-one".