16313681 has 2 divisors, whose sum is σ = 16313682. Its totient is φ = 16313680.

The previous prime is 16313663. The next prime is 16313683. The reversal of 16313681 is 18631361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15673681 + 640000 = 3959^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 16313681 - 2²² = 12119377 is a prime.

It is a super-2 number, since 2×16313681² = 532272375539522, which contains 22 as substring.

Together with 16313683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16313683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8156840 + 8156841.

It is an arithmetic number, because the mean of its divisors is an integer number (8156841).

Almost surely, 2^16313681 is an apocalyptic number.

It is an amenable number.

16313681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16313681 is an equidigital number, since it uses as much as digits as its factorization.

16313681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 16313681 is about 4039.0198068343. The cubic root of 16313681 is about 253.6202863772.

The spelling of 16313681 in words is "sixteen million, three hundred thirteen thousand, six hundred eighty-one".