25443139 has 2 divisors, whose sum is σ = 25443140. Its totient is φ = 25443138.

The previous prime is 25443137. The next prime is 25443149. The reversal of 25443139 is 93134452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25443139 - 2¹ = 25443137 is a prime.

Together with 25443137, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 25443139.

It is not a weakly prime, because it can be changed into another prime (25443133) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12721569 + 12721570.

It is an arithmetic number, because the mean of its divisors is an integer number (12721570).

Almost surely, 2^25443139 is an apocalyptic number.

25443139 is a deficient number, since it is larger than the sum of its proper divisors (1).

25443139 is an equidigital number, since it uses as much as digits as its factorization.

25443139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 25443139 is about 5044.1192491851. The cubic root of 25443139 is about 294.1193269763.

The spelling of 25443139 in words is "twenty-five million, four hundred forty-three thousand, one hundred thirty-nine".