25444561 has 2 divisors, whose sum is σ = 25444562. Its totient is φ = 25444560.

The previous prime is 25444547. The next prime is 25444579. The reversal of 25444561 is 16544452.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15484225 + 9960336 = 3935^2 + 3156^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25444561 is a prime.

It is not a weakly prime, because it can be changed into another prime (25444501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12722280 + 12722281.

It is an arithmetic number, because the mean of its divisors is an integer number (12722281).

Almost surely, 2^25444561 is an apocalyptic number.

It is an amenable number.

25444561 is a deficient number, since it is larger than the sum of its proper divisors (1).

25444561 is an equidigital number, since it uses as much as digits as its factorization.

25444561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 31.

The square root of 25444561 is about 5044.2602034392. The cubic root of 25444561 is about 294.1248062516.

The spelling of 25444561 in words is "twenty-five million, four hundred forty-four thousand, five hundred sixty-one".