2545621 has 4 divisors (see below), whose sum is σ = 2741452. Its totient is φ = 2349792.

The previous prime is 2545619. The next prime is 2545633. The reversal of 2545621 is 1265452.

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

It can be written as a sum of positive squares in 2 ways, for example, as 819025 + 1726596 = 905^2 + 1314^2 .

It is a cyclic number.

It is not a de Polignac number, because 2545621 - 2¹ = 2545619 is a prime.

It is the 1596-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2545651) by changing a digit.

It is a nontrivial repunit in base 1595.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97896 + ... + 97921.

It is an arithmetic number, because the mean of its divisors is an integer number (685363).

2^2545621 is an apocalyptic number.

It is an amenable number.

2545621 is a deficient number, since it is larger than the sum of its proper divisors (195831).

2545621 is a wasteful number, since it uses less digits than its factorization.

2545621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195830.

The product of its digits is 2400, while the sum is 25.

The square root of 2545621 is about 1595.5002350360. The cubic root of 2545621 is about 136.5414723684.

The spelling of 2545621 in words is "two million, five hundred forty-five thousand, six hundred twenty-one".