25520849 has 2 divisors, whose sum is σ = 25520850. Its totient is φ = 25520848.

The previous prime is 25520827. The next prime is 25520851. The reversal of 25520849 is 94802552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24403600 + 1117249 = 4940^2 + 1057^2 .

It is a cyclic number.

It is not a de Polignac number, because 25520849 - 2²⁴ = 8743633 is a prime.

Together with 25520851, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25520749) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12760424 + 12760425.

It is an arithmetic number, because the mean of its divisors is an integer number (12760425).

Almost surely, 2^25520849 is an apocalyptic number.

It is an amenable number.

25520849 is a deficient number, since it is larger than the sum of its proper divisors (1).

25520849 is an equidigital number, since it uses as much as digits as its factorization.

25520849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 25520849 is about 5051.8164060069. The cubic root of 25520849 is about 294.4184617501.

The spelling of 25520849 in words is "twenty-five million, five hundred twenty thousand, eight hundred forty-nine".