2545561 has 2 divisors, whose sum is σ = 2545562. Its totient is φ = 2545560.

The previous prime is 2545553. The next prime is 2545573. The reversal of 2545561 is 1655452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1974025 + 571536 = 1405^2 + 756^2 .

It is a cyclic number.

It is not a de Polignac number, because 2545561 - 2³ = 2545553 is a prime.

It is not a weakly prime, because it can be changed into another prime (2545261) 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 as a sum of consecutive naturals, namely, 1272780 + 1272781.

It is an arithmetic number, because the mean of its divisors is an integer number (1272781).

2^2545561 is an apocalyptic number.

It is an amenable number.

2545561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2545561 is an equidigital number, since it uses as much as digits as its factorization.

2545561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6000, while the sum is 28.

The square root of 2545561 is about 1595.4814320449. The cubic root of 2545561 is about 136.5403996042.

The spelling of 2545561 in words is "two million, five hundred forty-five thousand, five hundred sixty-one".