166511131 has 4 divisors (see below), whose sum is σ = 167431264. Its totient is φ = 165591000.

The previous prime is 166511129. The next prime is 166511143. The reversal of 166511131 is 131115661.

166511131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 166511131 - 2¹ = 166511129 is a prime.

It is a super-2 number, since 2×166511131² = 55451913493798322, 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 = 166511096 and 166511105.

It is not an unprimeable number, because it can be changed into a prime (166511101) 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, 459795 + ... + 460156.

It is an arithmetic number, because the mean of its divisors is an integer number (41857816).

Almost surely, 2^166511131 is an apocalyptic number.

166511131 is a deficient number, since it is larger than the sum of its proper divisors (920133).

166511131 is an equidigital number, since it uses as much as digits as its factorization.

166511131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920132.

The product of its digits is 540, while the sum is 25.

The square root of 166511131 is about 12903.9192108444. The cubic root of 166511131 is about 550.1499657175.

Adding to 166511131 its reverse (131115661), we get a palindrome (297626792).

The spelling of 166511131 in words is "one hundred sixty-six million, five hundred eleven thousand, one hundred thirty-one".