25457819 has 2 divisors, whose sum is σ = 25457820. Its totient is φ = 25457818.

The previous prime is 25457807. The next prime is 25457867. The reversal of 25457819 is 91875452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25457819 - 2¹² = 25453723 is a prime.

It is a super-2 number, since 2×25457819² = 1296201096473522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25457869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12728909 + 12728910.

It is an arithmetic number, because the mean of its divisors is an integer number (12728910).

Almost surely, 2^25457819 is an apocalyptic number.

25457819 is a deficient number, since it is larger than the sum of its proper divisors (1).

25457819 is an equidigital number, since it uses as much as digits as its factorization.

25457819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 41.

The square root of 25457819 is about 5045.5741992364. The cubic root of 25457819 is about 294.1758823879.

The spelling of 25457819 in words is "twenty-five million, four hundred fifty-seven thousand, eight hundred nineteen".