231991813135311 has 16 divisors (see below), whose sum is σ = 309772191792000. Its totient is φ = 154436324698080.

The previous prime is 231991813135297. The next prime is 231991813135321. The reversal of 231991813135311 is 113531318199132.

It is not a de Polignac number, because 231991813135311 - 2¹⁰ = 231991813134287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231991813135321) 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, 403427356 + ... + 404001998.

It is an arithmetic number, because the mean of its divisors is an integer number (19360761987000).

Almost surely, 2^{231991813135311} is an apocalyptic number.

231991813135311 is a deficient number, since it is larger than the sum of its proper divisors (77780378656689).

231991813135311 is a wasteful number, since it uses less digits than its factorization.

231991813135311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770086.

The product of its digits is 524880, while the sum is 51.

The spelling of 231991813135311 in words is "two hundred thirty-one trillion, nine hundred ninety-one billion, eight hundred thirteen million, one hundred thirty-five thousand, three hundred eleven".