16981699 has 4 divisors (see below), whose sum is σ = 19407664. Its totient is φ = 14555736.

The previous prime is 16981697. The next prime is 16981703. The reversal of 16981699 is 99618961.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16981699 - 2¹ = 16981697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16981697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212972 + ... + 1212985.

It is an arithmetic number, because the mean of its divisors is an integer number (4851916).

Almost surely, 2^16981699 is an apocalyptic number.

16981699 is a deficient number, since it is larger than the sum of its proper divisors (2425965).

16981699 is an equidigital number, since it uses as much as digits as its factorization.

16981699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425964.

The product of its digits is 209952, while the sum is 49.

The square root of 16981699 is about 4120.8857057676. The cubic root of 16981699 is about 257.0358572608.

The spelling of 16981699 in words is "sixteen million, nine hundred eighty-one thousand, six hundred ninety-nine".