2521557 has 16 divisors (see below), whose sum is σ = 3799360. Its totient is φ = 1652400.

The previous prime is 2521537. The next prime is 2521591. The reversal of 2521557 is 7551252.

It is a happy number.

It is not a de Polignac number, because 2521557 - 2⁷ = 2521429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 2⁷ + 5⁶ + 2²¹ + 1 + 5⁶ + 5⁸ + 7⁴ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2521557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 882 + ... + 2412.

It is an arithmetic number, because the mean of its divisors is an integer number (237460).

2^2521557 is an apocalyptic number.

2521557 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2521557 is a deficient number, since it is larger than the sum of its proper divisors (1277803).

2521557 is a wasteful number, since it uses less digits than its factorization.

2521557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601 (or 1595 counting only the distinct ones).

The product of its digits is 3500, while the sum is 27.

The square root of 2521557 is about 1587.9411198152. The cubic root of 2521557 is about 136.1098629284.

The spelling of 2521557 in words is "two million, five hundred twenty-one thousand, five hundred fifty-seven".