2557491 has 8 divisors (see below), whose sum is σ = 3458304. Its totient is φ = 1680840.

The previous prime is 2557453. The next prime is 2557501. The reversal of 2557491 is 1947552.

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

It is not a de Polignac number, because 2557491 - 2¹⁰ = 2556467 is a prime.

It is a d-powerful number, because it can be written as 2¹⁹ + 5³ + 5⁹ + 7⁵ + 4⁶ + 9⁵ + 1 .

2557491 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2557441) 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, 5791 + ... + 6216.

It is an arithmetic number, because the mean of its divisors is an integer number (432288).

2^2557491 is an apocalyptic number.

2557491 is a deficient number, since it is larger than the sum of its proper divisors (900813).

2557491 is a wasteful number, since it uses less digits than its factorization.

2557491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12081.

The product of its digits is 12600, while the sum is 33.

The square root of 2557491 is about 1599.2157452952. The cubic root of 2557491 is about 136.7533701921.

The spelling of 2557491 in words is "two million, five hundred fifty-seven thousand, four hundred ninety-one".