12152439891 has 6 divisors (see below), whose sum is σ = 17553524300. Its totient is φ = 8101626588.

The previous prime is 12152439857. The next prime is 12152439899. The reversal of 12152439891 is 19893425121.

12152439891 is a `hidden beast` number, since 1 + 2 + 1 + 524 + 39 + 8 + 91 = 666.

It is not a de Polignac number, because 12152439891 - 2¹⁹ = 12151915603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12152439899) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 675135541 + ... + 675135558.

Almost surely, 2^12152439891 is an apocalyptic number.

12152439891 is a deficient number, since it is larger than the sum of its proper divisors (5401084409).

12152439891 is a wasteful number, since it uses less digits than its factorization.

12152439891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350271105 (or 1350271102 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The spelling of 12152439891 in words is "twelve billion, one hundred fifty-two million, four hundred thirty-nine thousand, eight hundred ninety-one".