25855019 has 2 divisors, whose sum is σ = 25855020. Its totient is φ = 25855018.

The previous prime is 25855009. The next prime is 25855031. The reversal of 25855019 is 91055852.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25855019 - 2⁴ = 25855003 is a prime.

It is a super-2 number, since 2×25855019² = 1336964014980722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25855019.

It is not a weakly prime, because it can be changed into another prime (25855009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12927509 + 12927510.

It is an arithmetic number, because the mean of its divisors is an integer number (12927510).

Almost surely, 2^25855019 is an apocalyptic number.

25855019 is a deficient number, since it is larger than the sum of its proper divisors (1).

25855019 is an equidigital number, since it uses as much as digits as its factorization.

25855019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 35.

The square root of 25855019 is about 5084.7830828856. The cubic root of 25855019 is about 295.6979318917.

The spelling of 25855019 in words is "twenty-five million, eight hundred fifty-five thousand, nineteen".