231587668213 has 4 divisors (see below), whose sum is σ = 252641092608. Its totient is φ = 210534243820.

The previous prime is 231587668163. The next prime is 231587668231. The reversal of 231587668213 is 312866785132.

It is a happy number.

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 231587668213 - 2¹⁷ = 231587537141 is a prime.

It is a super-2 number, since 2×231587668213² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231587668313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10526712181 + ... + 10526712202.

It is an arithmetic number, because the mean of its divisors is an integer number (63160273152).

Almost surely, 2^231587668213 is an apocalyptic number.

It is an amenable number.

231587668213 is a deficient number, since it is larger than the sum of its proper divisors (21053424395).

231587668213 is a wasteful number, since it uses less digits than its factorization.

231587668213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21053424394.

The product of its digits is 2903040, while the sum is 52.

The spelling of 231587668213 in words is "two hundred thirty-one billion, five hundred eighty-seven million, six hundred sixty-eight thousand, two hundred thirteen".