25913519 has 2 divisors, whose sum is σ = 25913520. Its totient is φ = 25913518.

The previous prime is 25913441. The next prime is 25913521. The reversal of 25913519 is 91531952.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25913519 - 2⁸ = 25913263 is a prime.

It is a super-2 number, since 2×25913519² = 1343020933926722, which contains 22 as substring.

Together with 25913521, 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 (25913119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12956759 + 12956760.

It is an arithmetic number, because the mean of its divisors is an integer number (12956760).

Almost surely, 2^25913519 is an apocalyptic number.

25913519 is a deficient number, since it is larger than the sum of its proper divisors (1).

25913519 is an equidigital number, since it uses as much as digits as its factorization.

25913519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12150, while the sum is 35.

The square root of 25913519 is about 5090.5322904388. The cubic root of 25913519 is about 295.9207809369.

The spelling of 25913519 in words is "twenty-five million, nine hundred thirteen thousand, five hundred nineteen".