12554539391 has 2 divisors, whose sum is σ = 12554539392. Its totient is φ = 12554539390.

The previous prime is 12554539139. The next prime is 12554539399. The reversal of 12554539391 is 19393545521.

Together with previous prime (12554539139) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12554539391 - 2¹⁸ = 12554277247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12554539399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6277269695 + 6277269696.

It is an arithmetic number, because the mean of its divisors is an integer number (6277269696).

Almost surely, 2^12554539391 is an apocalyptic number.

12554539391 is a deficient number, since it is larger than the sum of its proper divisors (1).

12554539391 is an equidigital number, since it uses as much as digits as its factorization.

12554539391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 729000, while the sum is 47.

The spelling of 12554539391 in words is "twelve billion, five hundred fifty-four million, five hundred thirty-nine thousand, three hundred ninety-one".