25684619 has 2 divisors, whose sum is σ = 25684620. Its totient is φ = 25684618.

The previous prime is 25684597. The next prime is 25684621. The reversal of 25684619 is 91648652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25684619 is a prime.

It is a super-2 number, since 2×25684619² = 1319399306350322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 25684621, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25684639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12842309 + 12842310.

It is an arithmetic number, because the mean of its divisors is an integer number (12842310).

Almost surely, 2^25684619 is an apocalyptic number.

25684619 is a deficient number, since it is larger than the sum of its proper divisors (1).

25684619 is an equidigital number, since it uses as much as digits as its factorization.

25684619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 25684619 is about 5067.9995067087. Note that the first 3 decimals coincide. The cubic root of 25684619 is about 295.0468909470.

The spelling of 25684619 in words is "twenty-five million, six hundred eighty-four thousand, six hundred nineteen".