2557921231 has 4 divisors (see below), whose sum is σ = 2559116992. Its totient is φ = 2556725472.

The previous prime is 2557921217. The next prime is 2557921271. The reversal of 2557921231 is 1321297552.

It is a happy number.

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 2557921231 - 2⁹ = 2557920719 is a prime.

It is a super-2 number, since 2×2557921231² = 13085922048001110722, 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 (2557921211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594666 + ... + 598951.

It is an arithmetic number, because the mean of its divisors is an integer number (639779248).

Almost surely, 2^2557921231 is an apocalyptic number.

2557921231 is a deficient number, since it is larger than the sum of its proper divisors (1195761).

2557921231 is a wasteful number, since it uses less digits than its factorization.

2557921231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195760.

The product of its digits is 37800, while the sum is 37.

The square root of 2557921231 is about 50575.8957508416. The cubic root of 2557921231 is about 1367.6103815529.

The spelling of 2557921231 in words is "two billion, five hundred fifty-seven million, nine hundred twenty-one thousand, two hundred thirty-one".