166213241 has 4 divisors (see below), whose sum is σ = 166240500. Its totient is φ = 166185984.

The previous prime is 166213237. The next prime is 166213253. The reversal of 166213241 is 142312661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85285225 + 80928016 = 9235^2 + 8996^2 .

It is a cyclic number.

It is not a de Polignac number, because 166213241 - 2² = 166213237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166213241.

It is not an unprimeable number, because it can be changed into a prime (166213841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185 + ... + 18233.

It is an arithmetic number, because the mean of its divisors is an integer number (41560125).

Almost surely, 2^166213241 is an apocalyptic number.

It is an amenable number.

166213241 is a deficient number, since it is larger than the sum of its proper divisors (27259).

166213241 is an equidigital number, since it uses as much as digits as its factorization.

166213241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27258.

The product of its digits is 1728, while the sum is 26.

The square root of 166213241 is about 12892.3714265452. The cubic root of 166213241 is about 549.8216953697.

The spelling of 166213241 in words is "one hundred sixty-six million, two hundred thirteen thousand, two hundred forty-one".