2557961 has 4 divisors (see below), whose sum is σ = 2923392. Its totient is φ = 2192532.

The previous prime is 2557957. The next prime is 2557963. The reversal of 2557961 is 1697552.

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 2557961 - 2² = 2557957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2557963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182705 + ... + 182718.

It is an arithmetic number, because the mean of its divisors is an integer number (730848).

2^2557961 is an apocalyptic number.

It is an amenable number.

2557961 is a deficient number, since it is larger than the sum of its proper divisors (365431).

2557961 is an equidigital number, since it uses as much as digits as its factorization.

2557961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365430.

The product of its digits is 18900, while the sum is 35.

The square root of 2557961 is about 1599.3626855720. The cubic root of 2557961 is about 136.7617469107.

The spelling of 2557961 in words is "two million, five hundred fifty-seven thousand, nine hundred sixty-one".