25639543 has 2 divisors, whose sum is σ = 25639544. Its totient is φ = 25639542.

The previous prime is 25639507. The next prime is 25639561. The reversal of 25639543 is 34593652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25639543 - 2¹³ = 25631351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25639643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12819771 + 12819772.

It is an arithmetic number, because the mean of its divisors is an integer number (12819772).

Almost surely, 2^25639543 is an apocalyptic number.

25639543 is a deficient number, since it is larger than the sum of its proper divisors (1).

25639543 is an equidigital number, since it uses as much as digits as its factorization.

25639543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 37.

The square root of 25639543 is about 5063.5504342309. The cubic root of 25639543 is about 294.8741893859.

The spelling of 25639543 in words is "twenty-five million, six hundred thirty-nine thousand, five hundred forty-three".