25531549 has 2 divisors, whose sum is σ = 25531550. Its totient is φ = 25531548.

The previous prime is 25531523. The next prime is 25531553. The reversal of 25531549 is 94513552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25452025 + 79524 = 5045^2 + 282^2 .

It is a cyclic number.

It is not a de Polignac number, because 25531549 - 2¹¹ = 25529501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25531579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12765774 + 12765775.

It is an arithmetic number, because the mean of its divisors is an integer number (12765775).

Almost surely, 2^25531549 is an apocalyptic number.

It is an amenable number.

25531549 is a deficient number, since it is larger than the sum of its proper divisors (1).

25531549 is an equidigital number, since it uses as much as digits as its factorization.

25531549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 34.

The square root of 25531549 is about 5052.8753200529. The cubic root of 25531549 is about 294.4596024579.

The spelling of 25531549 in words is "twenty-five million, five hundred thirty-one thousand, five hundred forty-nine".