25116649 has 2 divisors, whose sum is σ = 25116650. Its totient is φ = 25116648.

The previous prime is 25116643. The next prime is 25116677. The reversal of 25116649 is 94661152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18705625 + 6411024 = 4325^2 + 2532^2 .

It is a cyclic number.

It is not a de Polignac number, because 25116649 - 2⁵ = 25116617 is a prime.

It is not a weakly prime, because it can be changed into another prime (25116643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12558324 + 12558325.

It is an arithmetic number, because the mean of its divisors is an integer number (12558325).

Almost surely, 2^25116649 is an apocalyptic number.

It is an amenable number.

25116649 is a deficient number, since it is larger than the sum of its proper divisors (1).

25116649 is an equidigital number, since it uses as much as digits as its factorization.

25116649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 25116649 is about 5011.6513246634. The cubic root of 25116649 is about 292.8558466502.

It can be divided in two parts, 251 and 16649, that added together give a square (16900 = 130²).

The spelling of 25116649 in words is "twenty-five million, one hundred sixteen thousand, six hundred forty-nine".