16617949 has 2 divisors, whose sum is σ = 16617950. Its totient is φ = 16617948.

The previous prime is 16617941. The next prime is 16617967. The reversal of 16617949 is 94971661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10517049 + 6100900 = 3243^2 + 2470^2 .

It is an emirp because it is prime and its reverse (94971661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16617949 - 2³ = 16617941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16617941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8308974 + 8308975.

It is an arithmetic number, because the mean of its divisors is an integer number (8308975).

Almost surely, 2^16617949 is an apocalyptic number.

It is an amenable number.

16617949 is a deficient number, since it is larger than the sum of its proper divisors (1).

16617949 is an equidigital number, since it uses as much as digits as its factorization.

16617949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 16617949 is about 4076.5118667802. The cubic root of 16617949 is about 255.1873491844.

The spelling of 16617949 in words is "sixteen million, six hundred seventeen thousand, nine hundred forty-nine".