25570819 has 2 divisors, whose sum is σ = 25570820. Its totient is φ = 25570818.

The previous prime is 25570817. The next prime is 25570841. The reversal of 25570819 is 91807552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25570819 - 2¹ = 25570817 is a prime.

It is a super-2 number, since 2×25570819² = 1307733568661522, which contains 22 as substring.

Together with 25570817, 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 (25570813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12785409 + 12785410.

It is an arithmetic number, because the mean of its divisors is an integer number (12785410).

Almost surely, 2^25570819 is an apocalyptic number.

25570819 is a deficient number, since it is larger than the sum of its proper divisors (1).

25570819 is an equidigital number, since it uses as much as digits as its factorization.

25570819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 25570819 is about 5056.7597332679. The cubic root of 25570819 is about 294.6104942701.

The spelling of 25570819 in words is "twenty-five million, five hundred seventy thousand, eight hundred nineteen".