231000321987 has 24 divisors (see below), whose sum is σ = 348097241856. Its totient is φ = 153078030792.

The previous prime is 231000321953. The next prime is 231000321989. The reversal of 231000321987 is 789123000132.

It is not a de Polignac number, because 231000321987 - 2⁸ = 231000321731 is a prime.

It is a super-2 number, since 2×231000321987² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231000321989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2805583 + ... + 2886744.

It is an arithmetic number, because the mean of its divisors is an integer number (14504051744).

Almost surely, 2^231000321987 is an apocalyptic number.

231000321987 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

231000321987 is a deficient number, since it is larger than the sum of its proper divisors (117096919869).

231000321987 is an equidigital number, since it uses as much as digits as its factorization.

231000321987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5692509 (or 5692497 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 231000321987 in words is "two hundred thirty-one billion, three hundred twenty-one thousand, nine hundred eighty-seven".