281166169 has 2 divisors, whose sum is σ = 281166170. Its totient is φ = 281166168.

The previous prime is 281166167. The next prime is 281166181. The reversal of 281166169 is 961661182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232166169 + 49000000 = 15237^2 + 7000^2 .

It is a cyclic number.

It is not a de Polignac number, because 281166169 - 2¹ = 281166167 is a prime.

It is a super-2 number, since 2×281166169² = 158108829180273122, which contains 22 as substring.

Together with 281166167, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (281166163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140583084 + 140583085.

It is an arithmetic number, because the mean of its divisors is an integer number (140583085).

Almost surely, 2^281166169 is an apocalyptic number.

It is an amenable number.

281166169 is a deficient number, since it is larger than the sum of its proper divisors (1).

281166169 is an equidigital number, since it uses as much as digits as its factorization.

281166169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 40.

The square root of 281166169 is about 16768.0102874491. The cubic root of 281166169 is about 655.1202459733.

The spelling of 281166169 in words is "two hundred eighty-one million, one hundred sixty-six thousand, one hundred sixty-nine".