231521535239987 has 4 divisors (see below), whose sum is σ = 231523640339976. Its totient is φ = 231519430140000.

The previous prime is 231521535239957. The next prime is 231521535239989. The reversal of 231521535239987 is 789932535125132.

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 231521535239987 - 2⁶ = 231521535239923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231521535239989) 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, 1052385014 + ... + 1052604987.

It is an arithmetic number, because the mean of its divisors is an integer number (57880910084994).

Almost surely, 2^{231521535239987} is an apocalyptic number.

231521535239987 is a deficient number, since it is larger than the sum of its proper divisors (2105099989).

231521535239987 is a wasteful number, since it uses less digits than its factorization.

231521535239987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105099988.

The product of its digits is 122472000, while the sum is 65.

The spelling of 231521535239987 in words is "two hundred thirty-one trillion, five hundred twenty-one billion, five hundred thirty-five million, two hundred thirty-nine thousand, nine hundred eighty-seven".