166547131 has 2 divisors, whose sum is σ = 166547132. Its totient is φ = 166547130.

The previous prime is 166547099. The next prime is 166547257. The reversal of 166547131 is 131745661.

It is a weak prime.

It is an emirp because it is prime and its reverse (131745661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166547131 - 2⁵ = 166547099 is a prime.

It is a super-2 number, since 2×166547131² = 55475893688662322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166547831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83273565 + 83273566.

It is an arithmetic number, because the mean of its divisors is an integer number (83273566).

Almost surely, 2^166547131 is an apocalyptic number.

166547131 is a deficient number, since it is larger than the sum of its proper divisors (1).

166547131 is an equidigital number, since it uses as much as digits as its factorization.

166547131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 166547131 is about 12905.3140604946. The cubic root of 166547131 is about 550.1896106579.

The spelling of 166547131 in words is "one hundred sixty-six million, five hundred forty-seven thousand, one hundred thirty-one".