210142169 has 2 divisors, whose sum is σ = 210142170. Its totient is φ = 210142168.

The previous prime is 210142111. The next prime is 210142171. The reversal of 210142169 is 961241012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195664144 + 14478025 = 13988^2 + 3805^2 .

It is a cyclic number.

It is not a de Polignac number, because 210142169 - 2²⁰ = 209093593 is a prime.

It is a super-2 number, since 2×210142169² = 88319462384049122, which contains 22 as substring.

Together with 210142171, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (210142189) 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, 105071084 + 105071085.

It is an arithmetic number, because the mean of its divisors is an integer number (105071085).

Almost surely, 2^210142169 is an apocalyptic number.

It is an amenable number.

210142169 is a deficient number, since it is larger than the sum of its proper divisors (1).

210142169 is an equidigital number, since it uses as much as digits as its factorization.

210142169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 210142169 is about 14496.2812127801. The cubic root of 210142169 is about 594.5262985804.

The spelling of 210142169 in words is "two hundred ten million, one hundred forty-two thousand, one hundred sixty-nine".