25390549 has 2 divisors, whose sum is σ = 25390550. Its totient is φ = 25390548.

The previous prime is 25390531. The next prime is 25390553. The reversal of 25390549 is 94509352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24354225 + 1036324 = 4935^2 + 1018^2 .

It is a cyclic number.

It is not a de Polignac number, because 25390549 - 2⁹ = 25390037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25390529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12695274 + 12695275.

It is an arithmetic number, because the mean of its divisors is an integer number (12695275).

Almost surely, 2^25390549 is an apocalyptic number.

It is an amenable number.

25390549 is a deficient number, since it is larger than the sum of its proper divisors (1).

25390549 is an equidigital number, since it uses as much as digits as its factorization.

25390549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 25390549 is about 5038.9035513691. The cubic root of 25390549 is about 293.9165427112.

The spelling of 25390549 in words is "twenty-five million, three hundred ninety thousand, five hundred forty-nine".