16851973 has 2 divisors, whose sum is σ = 16851974. Its totient is φ = 16851972.

The previous prime is 16851953. The next prime is 16851979. The reversal of 16851973 is 37915861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16785409 + 66564 = 4097^2 + 258^2 .

It is a cyclic number.

It is not a de Polignac number, because 16851973 - 2¹³ = 16843781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16851979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8425986 + 8425987.

It is an arithmetic number, because the mean of its divisors is an integer number (8425987).

Almost surely, 2^16851973 is an apocalyptic number.

It is an amenable number.

16851973 is a deficient number, since it is larger than the sum of its proper divisors (1).

16851973 is an equidigital number, since it uses as much as digits as its factorization.

16851973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 16851973 is about 4105.1154673164. The cubic root of 16851973 is about 256.3796704019.

The spelling of 16851973 in words is "sixteen million, eight hundred fifty-one thousand, nine hundred seventy-three".