15649841 has 2 divisors, whose sum is σ = 15649842. Its totient is φ = 15649840.

The previous prime is 15649819. The next prime is 15649847. The reversal of 15649841 is 14894651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8386816 + 7263025 = 2896^2 + 2695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15649841 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 15649795 and 15649804.

It is not a weakly prime, because it can be changed into another prime (15649847) 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, 7824920 + 7824921.

It is an arithmetic number, because the mean of its divisors is an integer number (7824921).

Almost surely, 2^15649841 is an apocalyptic number.

It is an amenable number.

15649841 is a deficient number, since it is larger than the sum of its proper divisors (1).

15649841 is an equidigital number, since it uses as much as digits as its factorization.

15649841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 38.

The square root of 15649841 is about 3955.9879929039. The cubic root of 15649841 is about 250.1324151858.

The spelling of 15649841 in words is "fifteen million, six hundred forty-nine thousand, eight hundred forty-one".