15966749 has 2 divisors, whose sum is σ = 15966750. Its totient is φ = 15966748.

The previous prime is 15966739. The next prime is 15966781. The reversal of 15966749 is 94766951.

15966749 = 2306² + 2307² + 2308².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15960025 + 6724 = 3995^2 + 82^2 .

It is a cyclic number.

It is not a de Polignac number, because 15966749 - 2⁸ = 15966493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15966739) 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, 7983374 + 7983375.

It is an arithmetic number, because the mean of its divisors is an integer number (7983375).

Almost surely, 2^15966749 is an apocalyptic number.

It is an amenable number.

15966749 is a deficient number, since it is larger than the sum of its proper divisors (1).

15966749 is an equidigital number, since it uses as much as digits as its factorization.

15966749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 47.

The square root of 15966749 is about 3995.8414633216. The cubic root of 15966749 is about 251.8095321068.

The spelling of 15966749 in words is "fifteen million, nine hundred sixty-six thousand, seven hundred forty-nine".