25521619 has 2 divisors, whose sum is σ = 25521620. Its totient is φ = 25521618.

The previous prime is 25521583. The next prime is 25521631. The reversal of 25521619 is 91612552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25521619 - 2⁷ = 25521491 is a prime.

It is a super-2 number, since 2×25521619² = 1302706072762322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25521679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12760809 + 12760810.

It is an arithmetic number, because the mean of its divisors is an integer number (12760810).

Almost surely, 2^25521619 is an apocalyptic number.

25521619 is a deficient number, since it is larger than the sum of its proper divisors (1).

25521619 is an equidigital number, since it uses as much as digits as its factorization.

25521619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 31.

The square root of 25521619 is about 5051.8926156442. The cubic root of 25521619 is about 294.4214227270.

The spelling of 25521619 in words is "twenty-five million, five hundred twenty-one thousand, six hundred nineteen".