25128619 has 2 divisors, whose sum is σ = 25128620. Its totient is φ = 25128618.

The previous prime is 25128617. The next prime is 25128643. The reversal of 25128619 is 91682152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25128619 - 2¹ = 25128617 is a prime.

It is a super-2 number, since 2×25128619² = 1262894985694322, which contains 22 as substring.

Together with 25128617, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25128611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12564309 + 12564310.

It is an arithmetic number, because the mean of its divisors is an integer number (12564310).

Almost surely, 2^25128619 is an apocalyptic number.

25128619 is a deficient number, since it is larger than the sum of its proper divisors (1).

25128619 is an equidigital number, since it uses as much as digits as its factorization.

25128619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 25128619 is about 5012.8453995710. The cubic root of 25128619 is about 292.9023619816.

The spelling of 25128619 in words is "twenty-five million, one hundred twenty-eight thousand, six hundred nineteen".