2556125431 has 4 divisors (see below), whose sum is σ = 2557035000. Its totient is φ = 2555215864.

The previous prime is 2556125357. The next prime is 2556125477. The reversal of 2556125431 is 1345216552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2556125431 - 2⁷ = 2556125303 is a prime.

It is a super-2 number, since 2×2556125431² = 13067554438009871522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556120431) 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 3 ways as a sum of consecutive naturals, for example, 450556 + ... + 456193.

It is an arithmetic number, because the mean of its divisors is an integer number (639258750).

Almost surely, 2^2556125431 is an apocalyptic number.

2556125431 is a deficient number, since it is larger than the sum of its proper divisors (909569).

2556125431 is an equidigital number, since it uses as much as digits as its factorization.

2556125431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909568.

The product of its digits is 36000, while the sum is 34.

The square root of 2556125431 is about 50558.1391172579. The cubic root of 2556125431 is about 1367.2902609727.

The spelling of 2556125431 in words is "two billion, five hundred fifty-six million, one hundred twenty-five thousand, four hundred thirty-one".