25430491 has 2 divisors, whose sum is σ = 25430492. Its totient is φ = 25430490.

The previous prime is 25430459. The next prime is 25430497. The reversal of 25430491 is 19403452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25430491 - 2⁵ = 25430459 is a prime.

It is not a weakly prime, because it can be changed into another prime (25430497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12715245 + 12715246.

It is an arithmetic number, because the mean of its divisors is an integer number (12715246).

Almost surely, 2^25430491 is an apocalyptic number.

25430491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25430491 is an equidigital number, since it uses as much as digits as its factorization.

25430491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 25430491 is about 5042.8653561244. The cubic root of 25430491 is about 294.0705824950.

It can be divided in two parts, 25430 and 491, that added together give a square (25921 = 161²).

The spelling of 25430491 in words is "twenty-five million, four hundred thirty thousand, four hundred ninety-one".