25128919 has 2 divisors, whose sum is σ = 25128920. Its totient is φ = 25128918.

The previous prime is 25128913. The next prime is 25128931. The reversal of 25128919 is 91982152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25128919 - 2³ = 25128911 is a prime.

It is a super-2 number, since 2×25128919² = 1262925140217122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25128911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12564459 + 12564460.

It is an arithmetic number, because the mean of its divisors is an integer number (12564460).

Almost surely, 2^25128919 is an apocalyptic number.

25128919 is a deficient number, since it is larger than the sum of its proper divisors (1).

25128919 is an equidigital number, since it uses as much as digits as its factorization.

25128919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 37.

The square root of 25128919 is about 5012.8753226068. The cubic root of 25128919 is about 292.9035275896.

The spelling of 25128919 in words is "twenty-five million, one hundred twenty-eight thousand, nine hundred nineteen".