2545921 has 8 divisors (see below), whose sum is σ = 2919744. Its totient is φ = 2174640.

The previous prime is 2545919. The next prime is 2545927. The reversal of 2545921 is 1295452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2545921 - 2¹ = 2545919 is a prime.

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 2545921.

It is not an unprimeable number, because it can be changed into a prime (2545927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2691 + ... + 3511.

It is an arithmetic number, because the mean of its divisors is an integer number (364968).

2^2545921 is an apocalyptic number.

It is an amenable number.

2545921 is a deficient number, since it is larger than the sum of its proper divisors (373823).

2545921 is an equidigital number, since it uses as much as digits as its factorization.

2545921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271.

The product of its digits is 3600, while the sum is 28.

The square root of 2545921 is about 1595.5942466680. The cubic root of 2545921 is about 136.5468359362.

The spelling of 2545921 in words is "two million, five hundred forty-five thousand, nine hundred twenty-one".