25306139 has 2 divisors, whose sum is σ = 25306140. Its totient is φ = 25306138.

The previous prime is 25306133. The next prime is 25306159. The reversal of 25306139 is 93160352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25306139 - 2⁸ = 25305883 is a prime.

It is not a weakly prime, because it can be changed into another prime (25306133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12653069 + 12653070.

It is an arithmetic number, because the mean of its divisors is an integer number (12653070).

Almost surely, 2^25306139 is an apocalyptic number.

25306139 is a deficient number, since it is larger than the sum of its proper divisors (1).

25306139 is an equidigital number, since it uses as much as digits as its factorization.

25306139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 25306139 is about 5030.5207483918. The cubic root of 25306139 is about 293.5904759920.

The spelling of 25306139 in words is "twenty-five million, three hundred six thousand, one hundred thirty-nine".