25915819 has 2 divisors, whose sum is σ = 25915820. Its totient is φ = 25915818.

The previous prime is 25915817. The next prime is 25915823. The reversal of 25915819 is 91851952.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25915819 - 2¹ = 25915817 is a prime.

It is a super-2 number, since 2×25915819² = 1343259348881522, which contains 22 as substring.

Together with 25915817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25915811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12957909 + 12957910.

It is an arithmetic number, because the mean of its divisors is an integer number (12957910).

Almost surely, 2^25915819 is an apocalyptic number.

25915819 is a deficient number, since it is larger than the sum of its proper divisors (1).

25915819 is an equidigital number, since it uses as much as digits as its factorization.

25915819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 40.

The square root of 25915819 is about 5090.7581950040. The cubic root of 25915819 is about 295.9295356679.

The spelling of 25915819 in words is "twenty-five million, nine hundred fifteen thousand, eight hundred nineteen".