25328491 has 2 divisors, whose sum is σ = 25328492. Its totient is φ = 25328490.

The previous prime is 25328483. The next prime is 25328507. The reversal of 25328491 is 19482352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25328491 - 2³ = 25328483 is a prime.

It is not a weakly prime, because it can be changed into another prime (25328431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12664245 + 12664246.

It is an arithmetic number, because the mean of its divisors is an integer number (12664246).

Almost surely, 2^25328491 is an apocalyptic number.

25328491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25328491 is an equidigital number, since it uses as much as digits as its factorization.

25328491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 25328491 is about 5032.7418968193. The cubic root of 25328491 is about 293.6768898483.

The spelling of 25328491 in words is "twenty-five million, three hundred twenty-eight thousand, four hundred ninety-one".