1231591394592 has 144 divisors (see below), whose sum is σ = 3911443361280. Its totient is φ = 378951167232.

The previous prime is 1231591394581. The next prime is 1231591394611. The reversal of 1231591394592 is 2954931951321.

It is a happy number.

1231591394592 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 59 + 139 + 459 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5990592 + ... + 6192767.

It is an arithmetic number, because the mean of its divisors is an integer number (27162801120).

Almost surely, 2^{1231591394592} is an apocalyptic number.

1231591394592 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1231591394592 is an abundant number, since it is smaller than the sum of its proper divisors (2679851966688).

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

1231591394592 is a wasteful number, since it uses less digits than its factorization.

1231591394592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12183397 (or 12183377 counting only the distinct ones).

The product of its digits is 2624400, while the sum is 54.

The spelling of 1231591394592 in words is "one trillion, two hundred thirty-one billion, five hundred ninety-one million, three hundred ninety-four thousand, five hundred ninety-two".