166709131 has 2 divisors, whose sum is σ = 166709132. Its totient is φ = 166709130.

The previous prime is 166709119. The next prime is 166709149. The reversal of 166709131 is 131907661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166709131 - 2⁷ = 166709003 is a prime.

It is a super-2 number, since 2×166709131² = 55583868717550322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166709831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83354565 + 83354566.

It is an arithmetic number, because the mean of its divisors is an integer number (83354566).

Almost surely, 2^166709131 is an apocalyptic number.

166709131 is a deficient number, since it is larger than the sum of its proper divisors (1).

166709131 is an equidigital number, since it uses as much as digits as its factorization.

166709131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 166709131 is about 12911.5890191719. The cubic root of 166709131 is about 550.3679422267.

The spelling of 166709131 in words is "one hundred sixty-six million, seven hundred nine thousand, one hundred thirty-one".