231987569081184 has 1536 divisors, whose sum is σ = 844252129566720. Its totient is φ = 60538503168000.

The previous prime is 231987569081171. The next prime is 231987569081239. The reversal of 231987569081184 is 481180965789132.

It is a happy number.

231987569081184 is a `hidden beast` number, since 2 + 319 + 8 + 7 + 56 + 9 + 0 + 81 + 184 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 181666067554 + ... + 181666068830.

It is an arithmetic number, because the mean of its divisors is an integer number (549643313520).

It is a 1-persistent number, because it is pandigital, but 2⋅231987569081184 = 463975138162368 is not.

Almost surely, 2^{231987569081184} is an apocalyptic number.

231987569081184 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231987569081184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (422126064783360).

231987569081184 is an abundant number, since it is smaller than the sum of its proper divisors (612264560485536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231987569081184 is a wasteful number, since it uses less digits than its factorization.

231987569081184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021 (or 2007 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 72.

The spelling of 231987569081184 in words is "two hundred thirty-one trillion, nine hundred eighty-seven billion, five hundred sixty-nine million, eighty-one thousand, one hundred eighty-four".