2557243191 has 8 divisors (see below), whose sum is σ = 3414726640. Its totient is φ = 1702294272.

The previous prime is 2557243181. The next prime is 2557243211. The reversal of 2557243191 is 1913427552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2557243191 - 2⁶ = 2557243127 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 (2557243181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 631276 + ... + 635313.

It is an arithmetic number, because the mean of its divisors is an integer number (426840830).

Almost surely, 2^2557243191 is an apocalyptic number.

2557243191 is a deficient number, since it is larger than the sum of its proper divisors (857483449).

2557243191 is a wasteful number, since it uses less digits than its factorization.

2557243191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267265.

The product of its digits is 75600, while the sum is 39.

The square root of 2557243191 is about 50569.1921133807. The cubic root of 2557243191 is about 1367.4895312731.

The spelling of 2557243191 in words is "two billion, five hundred fifty-seven million, two hundred forty-three thousand, one hundred ninety-one".