2545221 has 16 divisors (see below), whose sum is σ = 4083200. Its totient is φ = 1377648.

The previous prime is 2545211. The next prime is 2545237. The reversal of 2545221 is 1225452.

It is a happy number.

2545221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2545221 - 2⁷ = 2545093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

2545221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2545211) 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 15 ways as a sum of consecutive naturals, for example, 2791 + ... + 3588.

It is an arithmetic number, because the mean of its divisors is an integer number (255200).

2^2545221 is an apocalyptic number.

2545221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2545221 is a deficient number, since it is larger than the sum of its proper divisors (1537979).

2545221 is a wasteful number, since it uses less digits than its factorization.

2545221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6408.

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

The square root of 2545221 is about 1595.3748775758. The cubic root of 2545221 is about 136.5343202890.

The spelling of 2545221 in words is "two million, five hundred forty-five thousand, two hundred twenty-one".