25579919 has 2 divisors, whose sum is σ = 25579920. Its totient is φ = 25579918.

The previous prime is 25579907. The next prime is 25579921. The reversal of 25579919 is 91997552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25579919 - 2⁴ = 25579903 is a prime.

It is a super-2 number, since 2×25579919² = 1308664512093122, which contains 22 as substring.

Together with 25579921, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25579999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12789959 + 12789960.

It is an arithmetic number, because the mean of its divisors is an integer number (12789960).

Almost surely, 2^25579919 is an apocalyptic number.

25579919 is a deficient number, since it is larger than the sum of its proper divisors (1).

25579919 is an equidigital number, since it uses as much as digits as its factorization.

25579919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 255150, while the sum is 47.

The square root of 25579919 is about 5057.6594389105. The cubic root of 25579919 is about 294.6454382367.

The spelling of 25579919 in words is "twenty-five million, five hundred seventy-nine thousand, nine hundred nineteen".