16226681 has 2 divisors, whose sum is σ = 16226682. Its totient is φ = 16226680.

The previous prime is 16226677. The next prime is 16226701. The reversal of 16226681 is 18662261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13808656 + 2418025 = 3716^2 + 1555^2 .

It is a cyclic number.

It is not a de Polignac number, because 16226681 - 2² = 16226677 is a prime.

It is a super-2 number, since 2×16226681² = 526610352551522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16226621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8113340 + 8113341.

It is an arithmetic number, because the mean of its divisors is an integer number (8113341).

Almost surely, 2^16226681 is an apocalyptic number.

It is an amenable number.

16226681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16226681 is an equidigital number, since it uses as much as digits as its factorization.

16226681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 16226681 is about 4028.2354697808. The cubic root of 16226681 is about 253.1686346765.

The spelling of 16226681 in words is "sixteen million, two hundred twenty-six thousand, six hundred eighty-one".