123591991230 has 24 divisors (see below), whose sum is σ = 321339177432. Its totient is φ = 32957864304.

The previous prime is 123591991223. The next prime is 123591991231. The reversal of 123591991230 is 32199195321.

123591991230 is a `hidden beast` number, since 1 + 23 + 591 + 9 + 9 + 1 + 2 + 30 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123591991231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 686622084 + ... + 686622263.

It is an arithmetic number, because the mean of its divisors is an integer number (13389132393).

Almost surely, 2^123591991230 is an apocalyptic number.

123591991230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123591991230 is an abundant number, since it is smaller than the sum of its proper divisors (197747186202).

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

123591991230 is a wasteful number, since it uses less digits than its factorization.

123591991230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373244360 (or 1373244357 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The spelling of 123591991230 in words is "one hundred twenty-three billion, five hundred ninety-one million, nine hundred ninety-one thousand, two hundred thirty".