166031231 has 4 divisors (see below), whose sum is σ = 175797792. Its totient is φ = 156264672.

The previous prime is 166031207. The next prime is 166031237. The reversal of 166031231 is 132130661.

It is a happy number.

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-166031231 is a prime.

It is a super-2 number, since 2×166031231² = 55132739334750722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166031197 and 166031206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166031237) 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, 4883255 + ... + 4883288.

It is an arithmetic number, because the mean of its divisors is an integer number (43949448).

Almost surely, 2^166031231 is an apocalyptic number.

166031231 is a deficient number, since it is larger than the sum of its proper divisors (9766561).

166031231 is an equidigital number, since it uses as much as digits as its factorization.

166031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9766560.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 166031231 is about 12885.3106675780. The cubic root of 166031231 is about 549.6209299826.

Adding to 166031231 its reverse (132130661), we get a palindrome (298161892).

The spelling of 166031231 in words is "one hundred sixty-six million, thirty-one thousand, two hundred thirty-one".