231020929987 has 2 divisors, whose sum is σ = 231020929988. Its totient is φ = 231020929986.

The previous prime is 231020929967. The next prime is 231020930011. The reversal of 231020929987 is 789929020132.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231020929987 is a prime.

It is not a weakly prime, because it can be changed into another prime (231020929967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115510464993 + 115510464994.

It is an arithmetic number, because the mean of its divisors is an integer number (115510464994).

Almost surely, 2^231020929987 is an apocalyptic number.

231020929987 is a deficient number, since it is larger than the sum of its proper divisors (1).

231020929987 is an equidigital number, since it uses as much as digits as its factorization.

231020929987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 231020929987 in words is "two hundred thirty-one billion, twenty million, nine hundred twenty-nine thousand, nine hundred eighty-seven".