12491395277 has 4 divisors (see below), whose sum is σ = 12491713920. Its totient is φ = 12491076636.

The previous prime is 12491395237. The next prime is 12491395291. The reversal of 12491395277 is 77259319421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12491395277 - 2¹² = 12491391181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491395237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90653 + ... + 182210.

It is an arithmetic number, because the mean of its divisors is an integer number (3122928480).

Almost surely, 2^12491395277 is an apocalyptic number.

It is an amenable number.

12491395277 is a deficient number, since it is larger than the sum of its proper divisors (318643).

12491395277 is an equidigital number, since it uses as much as digits as its factorization.

12491395277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318642.

The product of its digits is 952560, while the sum is 50.

The spelling of 12491395277 in words is "twelve billion, four hundred ninety-one million, three hundred ninety-five thousand, two hundred seventy-seven".