25021019 has 2 divisors, whose sum is σ = 25021020. Its totient is φ = 25021018.

The previous prime is 25020979. The next prime is 25021021. The reversal of 25021019 is 91012052.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25021019 - 2⁸ = 25020763 is a prime.

It is a super-3 number, since 3×25021019³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

Together with 25021021, 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 (25021219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12510509 + 12510510.

It is an arithmetic number, because the mean of its divisors is an integer number (12510510).

Almost surely, 2^25021019 is an apocalyptic number.

25021019 is a deficient number, since it is larger than the sum of its proper divisors (1).

25021019 is an equidigital number, since it uses as much as digits as its factorization.

25021019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 25021019 is about 5002.1014583873. The cubic root of 25021019 is about 292.4836974380.

The spelling of 25021019 in words is "twenty-five million, twenty-one thousand, nineteen".