166201031 has 2 divisors, whose sum is σ = 166201032. Its totient is φ = 166201030.

The previous prime is 166200971. The next prime is 166201039. The reversal of 166201031 is 130102661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166201031 is a prime.

It is a super-2 number, since 2×166201031² = 55245565410925922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 166200994 and 166201012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166201039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83100515 + 83100516.

It is an arithmetic number, because the mean of its divisors is an integer number (83100516).

Almost surely, 2^166201031 is an apocalyptic number.

166201031 is a deficient number, since it is larger than the sum of its proper divisors (1).

166201031 is an equidigital number, since it uses as much as digits as its factorization.

166201031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 166201031 is about 12891.8978820033. The cubic root of 166201031 is about 549.8082317666.

Adding to 166201031 its reverse (130102661), we get a palindrome (296303692).

The spelling of 166201031 in words is "one hundred sixty-six million, two hundred one thousand, thirty-one".