25506619 has 2 divisors, whose sum is σ = 25506620. Its totient is φ = 25506618.

The previous prime is 25506587. The next prime is 25506623. The reversal of 25506619 is 91660552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25506619 - 2⁵ = 25506587 is a prime.

It is a super-2 number, since 2×25506619² = 1301175225622322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25506659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12753309 + 12753310.

It is an arithmetic number, because the mean of its divisors is an integer number (12753310).

Almost surely, 2^25506619 is an apocalyptic number.

25506619 is a deficient number, since it is larger than the sum of its proper divisors (1).

25506619 is an equidigital number, since it uses as much as digits as its factorization.

25506619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 25506619 is about 5050.4078053163. The cubic root of 25506619 is about 294.3637306342.

The spelling of 25506619 in words is "twenty-five million, five hundred six thousand, six hundred nineteen".