12538454591 has 6 divisors (see below), whose sum is σ = 13577143320. Its totient is φ = 11573957928.

The previous prime is 12538454549. The next prime is 12538454611. The reversal of 12538454591 is 19545483521.

It is not a de Polignac number, because 12538454591 - 2⁶ = 12538454527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12538454891) 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, 37095851 + ... + 37096188.

It is an arithmetic number, because the mean of its divisors is an integer number (2262857220).

Almost surely, 2^12538454591 is an apocalyptic number.

12538454591 is a deficient number, since it is larger than the sum of its proper divisors (1038688729).

12538454591 is an equidigital number, since it uses as much as digits as its factorization.

12538454591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74192065 (or 74192052 counting only the distinct ones).

The product of its digits is 864000, while the sum is 47.

The spelling of 12538454591 in words is "twelve billion, five hundred thirty-eight million, four hundred fifty-four thousand, five hundred ninety-one".