2577121391 has 6 divisors (see below), whose sum is σ = 2790610920. Its totient is φ = 2378881128.

The previous prime is 2577121369. The next prime is 2577121397. The reversal of 2577121391 is 1931217752.

It is a de Polignac number, because none of the positive numbers 2^k-2577121391 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 (2577121397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7624451 + ... + 7624788.

It is an arithmetic number, because the mean of its divisors is an integer number (465101820).

Almost surely, 2^2577121391 is an apocalyptic number.

2577121391 is a deficient number, since it is larger than the sum of its proper divisors (213489529).

2577121391 is a wasteful number, since it uses less digits than its factorization.

2577121391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15249265 (or 15249252 counting only the distinct ones).

The product of its digits is 26460, while the sum is 38.

The square root of 2577121391 is about 50765.3562087375. The cubic root of 2577121391 is about 1371.0236885114.

The spelling of 2577121391 in words is "two billion, five hundred seventy-seven million, one hundred twenty-one thousand, three hundred ninety-one".