16681207 has 2 divisors, whose sum is σ = 16681208. Its totient is φ = 16681206.

The previous prime is 16681139. The next prime is 16681213. The reversal of 16681207 is 70218661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16681207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16681277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340603 + 8340604.

It is an arithmetic number, because the mean of its divisors is an integer number (8340604).

Almost surely, 2^16681207 is an apocalyptic number.

16681207 is a deficient number, since it is larger than the sum of its proper divisors (1).

16681207 is an equidigital number, since it uses as much as digits as its factorization.

16681207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 16681207 is about 4084.2633362701. The cubic root of 16681207 is about 255.5107385037.

Adding to 16681207 its reverse (70218661), we get a palindrome (86899868).

The spelling of 16681207 in words is "sixteen million, six hundred eighty-one thousand, two hundred seven".