42159869 has 2 divisors, whose sum is σ = 42159870. Its totient is φ = 42159868.

The previous prime is 42159853. The next prime is 42159877. The reversal of 42159869 is 96895124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38278969 + 3880900 = 6187^2 + 1970^2 .

It is a cyclic number.

It is not a de Polignac number, because 42159869 - 2⁴ = 42159853 is a prime.

It is a super-2 number, since 2×42159869² = 3554909108194322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42159889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21079934 + 21079935.

It is an arithmetic number, because the mean of its divisors is an integer number (21079935).

Almost surely, 2^42159869 is an apocalyptic number.

It is an amenable number.

42159869 is a deficient number, since it is larger than the sum of its proper divisors (1).

42159869 is an equidigital number, since it uses as much as digits as its factorization.

42159869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 44.

The square root of 42159869 is about 6493.0631446183. The cubic root of 42159869 is about 348.0431448907.

The spelling of 42159869 in words is "forty-two million, one hundred fifty-nine thousand, eight hundred sixty-nine".