2557121 has 4 divisors (see below), whose sum is σ = 2922432. Its totient is φ = 2191812.

The previous prime is 2557111. The next prime is 2557127. The reversal of 2557121 is 1217552.

It is a happy number.

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 not a de Polignac number, because 2557121 - 2¹⁸ = 2294977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2557127) 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, 182645 + ... + 182658.

It is an arithmetic number, because the mean of its divisors is an integer number (730608).

2^2557121 is an apocalyptic number.

It is an amenable number.

2557121 is a deficient number, since it is larger than the sum of its proper divisors (365311).

2557121 is an equidigital number, since it uses as much as digits as its factorization.

2557121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365310.

The product of its digits is 700, while the sum is 23.

The square root of 2557121 is about 1599.1000594084. The cubic root of 2557121 is about 136.7467750321.

It can be divided in two parts, 25 and 57121, that multiplied together give a square (1428025 = 1195²).

The spelling of 2557121 in words is "two million, five hundred fifty-seven thousand, one hundred twenty-one".