2557081 has 4 divisors (see below), whose sum is σ = 2616592. Its totient is φ = 2497572.

The previous prime is 2557067. The next prime is 2557099. The reversal of 2557081 is 1807552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2557081 - 2⁹ = 2556569 is a prime.

It is a super-2 number, since 2×2557081² = 13077326481122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2557781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29691 + ... + 29776.

It is an arithmetic number, because the mean of its divisors is an integer number (654148).

2^2557081 is an apocalyptic number.

It is an amenable number.

2557081 is a deficient number, since it is larger than the sum of its proper divisors (59511).

2557081 is an equidigital number, since it uses as much as digits as its factorization.

2557081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59510.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 2557081 is about 1599.0875523248. The cubic root of 2557081 is about 136.7460620037.

It can be divided in two parts, 25570 and 81, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 2557081 in words is "two million, five hundred fifty-seven thousand, eighty-one".