2545021 has 2 divisors, whose sum is σ = 2545022. Its totient is φ = 2545020.

The previous prime is 2545013. The next prime is 2545057. The reversal of 2545021 is 1205452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1473796 + 1071225 = 1214^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 2545021 - 2³ = 2545013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2545021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2545001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272510 + 1272511.

It is an arithmetic number, because the mean of its divisors is an integer number (1272511).

2^2545021 is an apocalyptic number.

It is an amenable number.

2545021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2545021 is an equidigital number, since it uses as much as digits as its factorization.

2545021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 2545021 is about 1595.3121951518. The cubic root of 2545021 is about 136.5307439684.

The spelling of 2545021 in words is "two million, five hundred forty-five thousand, twenty-one".