2542521 has 4 divisors (see below), whose sum is σ = 3390032. Its totient is φ = 1695012.

The previous prime is 2542513. The next prime is 2542531. The reversal of 2542521 is 1252452.

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 2542521 - 2³ = 2542513 is a prime.

It is a D-number.

It is a Duffinian number.

2542521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2542511) 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 3 ways as a sum of consecutive naturals, for example, 423751 + ... + 423756.

It is an arithmetic number, because the mean of its divisors is an integer number (847508).

2^2542521 is an apocalyptic number.

It is an amenable number.

2542521 is a deficient number, since it is larger than the sum of its proper divisors (847511).

2542521 is an equidigital number, since it uses as much as digits as its factorization.

2542521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847510.

The product of its digits is 800, while the sum is 21.

The square root of 2542521 is about 1594.5284569427. The cubic root of 2542521 is about 136.4860241430.

Adding to 2542521 its reverse (1252452), we get a palindrome (3794973).

It can be divided in two parts, 254 and 2521, that added together give a triangular number (2775 = T₇₄).

The spelling of 2542521 in words is "two million, five hundred forty-two thousand, five hundred twenty-one".