25817149 has 2 divisors, whose sum is σ = 25817150. Its totient is φ = 25817148.

The previous prime is 25817137. The next prime is 25817153. The reversal of 25817149 is 94171852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13616100 + 12201049 = 3690^2 + 3493^2 .

It is a cyclic number.

It is not a de Polignac number, because 25817149 - 2⁵ = 25817117 is a prime.

It is a super-3 number, since 3×25817149³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25817119) 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, 12908574 + 12908575.

It is an arithmetic number, because the mean of its divisors is an integer number (12908575).

Almost surely, 2^25817149 is an apocalyptic number.

It is an amenable number.

25817149 is a deficient number, since it is larger than the sum of its proper divisors (1).

25817149 is an equidigital number, since it uses as much as digits as its factorization.

25817149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The square root of 25817149 is about 5081.0578622960. The cubic root of 25817149 is about 295.5534911749.

It can be divided in two parts, 2581 and 7149, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 25817149 in words is "twenty-five million, eight hundred seventeen thousand, one hundred forty-nine".