25491539 has 2 divisors, whose sum is σ = 25491540. Its totient is φ = 25491538.

The previous prime is 25491523. The next prime is 25491553. The reversal of 25491539 is 93519452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25491539 - 2⁴ = 25491523 is a prime.

It is not a weakly prime, because it can be changed into another prime (25491139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12745769 + 12745770.

It is an arithmetic number, because the mean of its divisors is an integer number (12745770).

Almost surely, 2^25491539 is an apocalyptic number.

25491539 is a deficient number, since it is larger than the sum of its proper divisors (1).

25491539 is an equidigital number, since it uses as much as digits as its factorization.

25491539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 38.

The square root of 25491539 is about 5048.9146358401. The cubic root of 25491539 is about 294.3057080460.

The spelling of 25491539 in words is "twenty-five million, four hundred ninety-one thousand, five hundred thirty-nine".