25999949 has 2 divisors, whose sum is σ = 25999950. Its totient is φ = 25999948.

The previous prime is 25999933. The next prime is 26000003. The reversal of 25999949 is 94999952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13875625 + 12124324 = 3725^2 + 3482^2 .

It is a cyclic number.

It is not a de Polignac number, because 25999949 - 2⁴ = 25999933 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25999894 and 25999903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25999249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12999974 + 12999975.

It is an arithmetic number, because the mean of its divisors is an integer number (12999975).

Almost surely, 2^25999949 is an apocalyptic number.

It is an amenable number.

25999949 is a deficient number, since it is larger than the sum of its proper divisors (1).

25999949 is an equidigital number, since it uses as much as digits as its factorization.

25999949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2361960, while the sum is 56.

The square root of 25999949 is about 5099.0145126289. The cubic root of 25999949 is about 296.2494131389.

The spelling of 25999949 in words is "twenty-five million, nine hundred ninety-nine thousand, nine hundred forty-nine".