16873781 has 2 divisors, whose sum is σ = 16873782. Its totient is φ = 16873780.

The previous prime is 16873751. The next prime is 16873783. The reversal of 16873781 is 18737861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16273156 + 600625 = 4034^2 + 775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16873781 is a prime.

It is a super-2 number, since 2×16873781² = 569448970471922, which contains 22 as substring.

Together with 16873783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16873783) 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 as a sum of consecutive naturals, namely, 8436890 + 8436891.

It is an arithmetic number, because the mean of its divisors is an integer number (8436891).

Almost surely, 2^16873781 is an apocalyptic number.

It is an amenable number.

16873781 is a deficient number, since it is larger than the sum of its proper divisors (1).

16873781 is an equidigital number, since it uses as much as digits as its factorization.

16873781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 41.

The square root of 16873781 is about 4107.7708066541. The cubic root of 16873781 is about 256.4902156730.

The spelling of 16873781 in words is "sixteen million, eight hundred seventy-three thousand, seven hundred eighty-one".