166931 has 2 divisors, whose sum is σ = 166932. Its totient is φ = 166930.

The previous prime is 166919. The next prime is 166949. The reversal of 166931 is 139661.

It is a weak prime.

It is an emirp because it is prime and its reverse (139661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166931 - 2⁶ = 166867 is a prime.

It is a super-2 number, since 2×166931² = 55731917522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166931.

It is not a weakly prime, because it can be changed into another prime (166031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83465 + 83466.

It is an arithmetic number, because the mean of its divisors is an integer number (83466).

2¹⁶⁶⁹³¹ is an apocalyptic number.

166931 is a deficient number, since it is larger than the sum of its proper divisors (1).

166931 is an equidigital number, since it uses as much as digits as its factorization.

166931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 26.

The square root of 166931 is about 408.5719030966. The cubic root of 166931 is about 55.0611990955.

The spelling of 166931 in words is "one hundred sixty-six thousand, nine hundred thirty-one".