16430681 has 2 divisors, whose sum is σ = 16430682. Its totient is φ = 16430680.

The previous prime is 16430641. The next prime is 16430693. The reversal of 16430681 is 18603461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12187081 + 4243600 = 3491^2 + 2060^2 .

It is an emirp because it is prime and its reverse (18603461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16430681 is a prime.

It is a super-2 number, since 2×16430681² = 539934556247522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16430641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8215340 + 8215341.

It is an arithmetic number, because the mean of its divisors is an integer number (8215341).

Almost surely, 2^16430681 is an apocalyptic number.

It is an amenable number.

16430681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16430681 is an equidigital number, since it uses as much as digits as its factorization.

16430681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 16430681 is about 4053.4776427162. The cubic root of 16430681 is about 254.2251553055.

The spelling of 16430681 in words is "sixteen million, four hundred thirty thousand, six hundred eighty-one".