25561189 has 2 divisors, whose sum is σ = 25561190. Its totient is φ = 25561188.

The previous prime is 25561147. The next prime is 25561199. The reversal of 25561189 is 98116552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16136289 + 9424900 = 4017^2 + 3070^2 .

It is a cyclic number.

It is not a de Polignac number, because 25561189 - 2¹³ = 25552997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25561139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12780594 + 12780595.

It is an arithmetic number, because the mean of its divisors is an integer number (12780595).

Almost surely, 2^25561189 is an apocalyptic number.

It is an amenable number.

25561189 is a deficient number, since it is larger than the sum of its proper divisors (1).

25561189 is an equidigital number, since it uses as much as digits as its factorization.

25561189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 37.

The square root of 25561189 is about 5055.8074528210. The cubic root of 25561189 is about 294.5735060755.

The spelling of 25561189 in words is "twenty-five million, five hundred sixty-one thousand, one hundred eighty-nine".