166933531 has 4 divisors (see below), whose sum is σ = 167078232. Its totient is φ = 166788832.

The previous prime is 166933511. The next prime is 166933583. The reversal of 166933531 is 135339661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135339661 = 8599 ⋅15739.

It is a cyclic number.

It is not a de Polignac number, because 166933531 - 2¹⁷ = 166802459 is a prime.

It is a super-2 number, since 2×166933531² = 55733607544255922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166933511) 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, 70606 + ... + 72931.

It is an arithmetic number, because the mean of its divisors is an integer number (41769558).

Almost surely, 2^166933531 is an apocalyptic number.

166933531 is the 8172-nd centered pentagonal number.

166933531 is a deficient number, since it is larger than the sum of its proper divisors (144701).

166933531 is a wasteful number, since it uses less digits than its factorization.

166933531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144700.

The product of its digits is 43740, while the sum is 37.

The square root of 166933531 is about 12920.2759645450. The cubic root of 166933531 is about 550.6147737251.

The spelling of 166933531 in words is "one hundred sixty-six million, nine hundred thirty-three thousand, five hundred thirty-one".