166231839 has 4 divisors (see below), whose sum is σ = 221642456. Its totient is φ = 110821224.

The previous prime is 166231829. The next prime is 166231843. The reversal of 166231839 is 938132661.

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

It is a de Polignac number, because none of the positive numbers 2^k-166231839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166231797 and 166231806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166231829) 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, 27705304 + ... + 27705309.

It is an arithmetic number, because the mean of its divisors is an integer number (55410614).

Almost surely, 2^166231839 is an apocalyptic number.

166231839 is a deficient number, since it is larger than the sum of its proper divisors (55410617).

166231839 is an equidigital number, since it uses as much as digits as its factorization.

166231839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55410616.

The product of its digits is 46656, while the sum is 39.

The square root of 166231839 is about 12893.0926856205. The cubic root of 166231839 is about 549.8422015629.

The spelling of 166231839 in words is "one hundred sixty-six million, two hundred thirty-one thousand, eight hundred thirty-nine".