16983991 has 2 divisors, whose sum is σ = 16983992. Its totient is φ = 16983990.

The previous prime is 16983983. The next prime is 16983997. The reversal of 16983991 is 19938961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16983991 - 2³ = 16983983 is a prime.

It is a super-3 number, since 3×16983991³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16983997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8491995 + 8491996.

It is an arithmetic number, because the mean of its divisors is an integer number (8491996).

Almost surely, 2^16983991 is an apocalyptic number.

16983991 is a deficient number, since it is larger than the sum of its proper divisors (1).

16983991 is an equidigital number, since it uses as much as digits as its factorization.

16983991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 46.

The square root of 16983991 is about 4121.1637919403. The cubic root of 16983991 is about 257.0474206833.

The spelling of 16983991 in words is "sixteen million, nine hundred eighty-three thousand, nine hundred ninety-one".