12391523285 has 8 divisors (see below), whose sum is σ = 14907285816. Its totient is φ = 9888246720.

The previous prime is 12391523279. The next prime is 12391523293. The reversal of 12391523285 is 58232519321.

It can be written as a sum of positive squares in 4 ways, for example, as 2633639761 + 9757883524 = 51319^2 + 98782^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12391523285 - 2²⁰ = 12390474709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3119306 + ... + 3123275.

It is an arithmetic number, because the mean of its divisors is an integer number (1863410727).

Almost surely, 2^12391523285 is an apocalyptic number.

It is an amenable number.

12391523285 is a deficient number, since it is larger than the sum of its proper divisors (2515762531).

12391523285 is an equidigital number, since it uses as much as digits as its factorization.

12391523285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6242983.

The product of its digits is 129600, while the sum is 41.

The spelling of 12391523285 in words is "twelve billion, three hundred ninety-one million, five hundred twenty-three thousand, two hundred eighty-five".