166949281 has 2 divisors, whose sum is σ = 166949282. Its totient is φ = 166949280.

The previous prime is 166949273. The next prime is 166949287. The reversal of 166949281 is 182949661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153140625 + 13808656 = 12375^2 + 3716^2 .

It is a cyclic number.

It is not a de Polignac number, because 166949281 - 2³ = 166949273 is a prime.

It is a super-2 number, since 2×166949281² = 55744124852833922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166949287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83474640 + 83474641.

It is an arithmetic number, because the mean of its divisors is an integer number (83474641).

Almost surely, 2^166949281 is an apocalyptic number.

It is an amenable number.

166949281 is a deficient number, since it is larger than the sum of its proper divisors (1).

166949281 is an equidigital number, since it uses as much as digits as its factorization.

166949281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 166949281 is about 12920.8854572742. The cubic root of 166949281 is about 550.6320898188.

The spelling of 166949281 in words is "one hundred sixty-six million, nine hundred forty-nine thousand, two hundred eighty-one".