25505549 has 2 divisors, whose sum is σ = 25505550. Its totient is φ = 25505548.

The previous prime is 25505539. The next prime is 25505609. The reversal of 25505549 is 94550552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24255625 + 1249924 = 4925^2 + 1118^2 .

It is a cyclic number.

It is not a de Polignac number, because 25505549 - 2¹⁶ = 25440013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25505509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12752774 + 12752775.

It is an arithmetic number, because the mean of its divisors is an integer number (12752775).

Almost surely, 2^25505549 is an apocalyptic number.

It is an amenable number.

25505549 is a deficient number, since it is larger than the sum of its proper divisors (1).

25505549 is an equidigital number, since it uses as much as digits as its factorization.

25505549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 25505549 is about 5050.3018721657. The cubic root of 25505549 is about 294.3596144008.

The spelling of 25505549 in words is "twenty-five million, five hundred five thousand, five hundred forty-nine".