15966949 has 2 divisors, whose sum is σ = 15966950. Its totient is φ = 15966948.

The previous prime is 15966947. The next prime is 15966967. The reversal of 15966949 is 94966951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15350724 + 616225 = 3918^2 + 785^2 .

It is an emirp because it is prime and its reverse (94966951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15966949 - 2¹ = 15966947 is a prime.

Together with 15966947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15966941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7983474 + 7983475.

It is an arithmetic number, because the mean of its divisors is an integer number (7983475).

Almost surely, 2^15966949 is an apocalyptic number.

It is an amenable number.

15966949 is a deficient number, since it is larger than the sum of its proper divisors (1).

15966949 is an equidigital number, since it uses as much as digits as its factorization.

15966949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 49.

The square root of 15966949 is about 3995.8664892611. The cubic root of 15966949 is about 251.8105834938.

The spelling of 15966949 in words is "fifteen million, nine hundred sixty-six thousand, nine hundred forty-nine".