16957649 has 2 divisors, whose sum is σ = 16957650. Its totient is φ = 16957648.

The previous prime is 16957621. The next prime is 16957669. The reversal of 16957649 is 94675961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15840400 + 1117249 = 3980^2 + 1057^2 .

It is an emirp because it is prime and its reverse (94675961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16957649 - 2²⁰ = 15909073 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16957669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8478824 + 8478825.

It is an arithmetic number, because the mean of its divisors is an integer number (8478825).

Almost surely, 2^16957649 is an apocalyptic number.

It is an amenable number.

16957649 is a deficient number, since it is larger than the sum of its proper divisors (1).

16957649 is an equidigital number, since it uses as much as digits as its factorization.

16957649 is an evil number, because the sum of its binary digits is even.

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

The square root of 16957649 is about 4117.9666098695. The cubic root of 16957649 is about 256.9144592603.

The spelling of 16957649 in words is "sixteen million, nine hundred fifty-seven thousand, six hundred forty-nine".