25551139 has 2 divisors, whose sum is σ = 25551140. Its totient is φ = 25551138.

The previous prime is 25551109. The next prime is 25551173. The reversal of 25551139 is 93115552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25551139 - 2⁷ = 25551011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25551139.

It is not a weakly prime, because it can be changed into another prime (25551109) 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, 12775569 + 12775570.

It is an arithmetic number, because the mean of its divisors is an integer number (12775570).

Almost surely, 2^25551139 is an apocalyptic number.

25551139 is a deficient number, since it is larger than the sum of its proper divisors (1).

25551139 is an equidigital number, since it uses as much as digits as its factorization.

25551139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6750, while the sum is 31.

The square root of 25551139 is about 5054.8134485854. The cubic root of 25551139 is about 294.5348947807.

The spelling of 25551139 in words is "twenty-five million, five hundred fifty-one thousand, one hundred thirty-nine".