25188521 has 2 divisors, whose sum is σ = 25188522. Its totient is φ = 25188520.

The previous prime is 25188487. The next prime is 25188529. The reversal of 25188521 is 12588152.

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., 25110121 + 78400 = 5011^2 + 280^2 .

It is a cyclic number.

It is not a de Polignac number, because 25188521 - 2²² = 20994217 is a prime.

It is not a weakly prime, because it can be changed into another prime (25188529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12594260 + 12594261.

It is an arithmetic number, because the mean of its divisors is an integer number (12594261).

Almost surely, 2^25188521 is an apocalyptic number.

It is an amenable number.

25188521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25188521 is an equidigital number, since it uses as much as digits as its factorization.

25188521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6400, while the sum is 32.

The square root of 25188521 is about 5018.8166932057. The cubic root of 25188521 is about 293.1349190516.

The spelling of 25188521 in words is "twenty-five million, one hundred eighty-eight thousand, five hundred twenty-one".