2557651 has 4 divisors (see below), whose sum is σ = 2570832. Its totient is φ = 2544472.

The previous prime is 2557649. The next prime is 2557663. The reversal of 2557651 is 1567552.

2557651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2557651 - 2¹ = 2557649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2557601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6295 + ... + 6688.

It is an arithmetic number, because the mean of its divisors is an integer number (642708).

2^2557651 is an apocalyptic number.

2557651 is a deficient number, since it is larger than the sum of its proper divisors (13181).

2557651 is a wasteful number, since it uses less digits than its factorization.

2557651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13180.

The product of its digits is 10500, while the sum is 31.

The square root of 2557651 is about 1599.2657690328. The cubic root of 2557651 is about 136.7562219562.

Subtracting from 2557651 its reverse (1567552), we obtain a palindrome (990099).

The spelling of 2557651 in words is "two million, five hundred fifty-seven thousand, six hundred fifty-one".