2557189931 has 2 divisors, whose sum is σ = 2557189932. Its totient is φ = 2557189930.

The previous prime is 2557189909. The next prime is 2557189949. The reversal of 2557189931 is 1399817552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2557189931 - 2¹⁴ = 2557173547 is a prime.

It is a super-3 number, since 3×2557189931³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 2557189931.

It is not a weakly prime, because it can be changed into another prime (2557189031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278594965 + 1278594966.

It is an arithmetic number, because the mean of its divisors is an integer number (1278594966).

Almost surely, 2^2557189931 is an apocalyptic number.

2557189931 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557189931 is an equidigital number, since it uses as much as digits as its factorization.

2557189931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 50.

The square root of 2557189931 is about 50568.6655054293. The cubic root of 2557189931 is about 1367.4800375862.

The spelling of 2557189931 in words is "two billion, five hundred fifty-seven million, one hundred eighty-nine thousand, nine hundred thirty-one".