166310531 has 2 divisors, whose sum is σ = 166310532. Its totient is φ = 166310530.

The previous prime is 166310513. The next prime is 166310533. The reversal of 166310531 is 135013661.

166310531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (166310513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (135013661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166310531 - 2¹⁸ = 166048387 is a prime.

It is a super-2 number, since 2×166310531² = 55318385443003922, which contains 22 as substring.

Together with 166310533, it forms a pair of twin primes.

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 166310531.

It is not a weakly prime, because it can be changed into another prime (166310533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83155265 + 83155266.

It is an arithmetic number, because the mean of its divisors is an integer number (83155266).

Almost surely, 2^166310531 is an apocalyptic number.

166310531 is a deficient number, since it is larger than the sum of its proper divisors (1).

166310531 is an equidigital number, since it uses as much as digits as its factorization.

166310531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 166310531 is about 12896.1440361063. The cubic root of 166310531 is about 549.9289506018.

The spelling of 166310531 in words is "one hundred sixty-six million, three hundred ten thousand, five hundred thirty-one".