166441139 has 4 divisors (see below), whose sum is σ = 171810240. Its totient is φ = 161072040.

The previous prime is 166441117. The next prime is 166441141. The reversal of 166441139 is 931144661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166441139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166441099 and 166441108.

It is not an unprimeable number, because it can be changed into a prime (166441439) 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, 2684504 + ... + 2684565.

It is an arithmetic number, because the mean of its divisors is an integer number (42952560).

Almost surely, 2^166441139 is an apocalyptic number.

166441139 is a deficient number, since it is larger than the sum of its proper divisors (5369101).

166441139 is an equidigital number, since it uses as much as digits as its factorization.

166441139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5369100.

The product of its digits is 15552, while the sum is 35.

The square root of 166441139 is about 12901.2068815286. The cubic root of 166441139 is about 550.0728707855.

The spelling of 166441139 in words is "one hundred sixty-six million, four hundred forty-one thousand, one hundred thirty-nine".