42186169 has 2 divisors, whose sum is σ = 42186170. Its totient is φ = 42186168.

The previous prime is 42186167. The next prime is 42186181. The reversal of 42186169 is 96168124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40793769 + 1392400 = 6387^2 + 1180^2 .

It is a cyclic number.

It is not a de Polignac number, because 42186169 - 2¹ = 42186167 is a prime.

It is a super-2 number, since 2×42186169² = 3559345709793122, which contains 22 as substring.

Together with 42186167, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42186167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21093084 + 21093085.

It is an arithmetic number, because the mean of its divisors is an integer number (21093085).

Almost surely, 2^42186169 is an apocalyptic number.

It is an amenable number.

42186169 is a deficient number, since it is larger than the sum of its proper divisors (1).

42186169 is an equidigital number, since it uses as much as digits as its factorization.

42186169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 42186169 is about 6495.0880671474. The cubic root of 42186169 is about 348.1155014722.

The spelling of 42186169 in words is "forty-two million, one hundred eighty-six thousand, one hundred sixty-nine".