25188997 has 2 divisors, whose sum is σ = 25188998. Its totient is φ = 25188996.

The previous prime is 25188991. The next prime is 25189001. The reversal of 25188997 is 79988152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24265476 + 923521 = 4926^2 + 961^2 .

It is a cyclic number.

It is not a de Polignac number, because 25188997 - 2¹⁹ = 24664709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25188997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25188991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12594498 + 12594499.

It is an arithmetic number, because the mean of its divisors is an integer number (12594499).

Almost surely, 2^25188997 is an apocalyptic number.

It is an amenable number.

25188997 is a deficient number, since it is larger than the sum of its proper divisors (1).

25188997 is an equidigital number, since it uses as much as digits as its factorization.

25188997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 49.

The square root of 25188997 is about 5018.8641145183. The cubic root of 25188997 is about 293.1367655454.

The spelling of 25188997 in words is "twenty-five million, one hundred eighty-eight thousand, nine hundred ninety-seven".