42171769 has 2 divisors, whose sum is σ = 42171770. Its totient is φ = 42171768.

The previous prime is 42171763. The next prime is 42171791. The reversal of 42171769 is 96717124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27426169 + 14745600 = 5237^2 + 3840^2 .

It is a cyclic number.

It is not a de Polignac number, because 42171769 - 2³ = 42171761 is a prime.

It is a super-2 number, since 2×42171769² = 3556916201178722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42171761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21085884 + 21085885.

It is an arithmetic number, because the mean of its divisors is an integer number (21085885).

Almost surely, 2^42171769 is an apocalyptic number.

It is an amenable number.

42171769 is a deficient number, since it is larger than the sum of its proper divisors (1).

42171769 is an equidigital number, since it uses as much as digits as its factorization.

42171769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 37.

The square root of 42171769 is about 6493.9794425298. The cubic root of 42171769 is about 348.0758879068.

The spelling of 42171769 in words is "forty-two million, one hundred seventy-one thousand, seven hundred sixty-nine".