42861569 has 2 divisors, whose sum is σ = 42861570. Its totient is φ = 42861568.

The previous prime is 42861557. The next prime is 42861601. The reversal of 42861569 is 96516824.

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., 41731600 + 1129969 = 6460^2 + 1063^2 .

It is a cyclic number.

It is not a de Polignac number, because 42861569 - 2¹² = 42857473 is a prime.

It is a super-2 number, since 2×42861569² = 3674228194283522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42867569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21430784 + 21430785.

It is an arithmetic number, because the mean of its divisors is an integer number (21430785).

Almost surely, 2^42861569 is an apocalyptic number.

It is an amenable number.

42861569 is a deficient number, since it is larger than the sum of its proper divisors (1).

42861569 is an equidigital number, since it uses as much as digits as its factorization.

42861569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 42861569 is about 6546.8747505967. The cubic root of 42861569 is about 349.9634492443.

The spelling of 42861569 in words is "forty-two million, eight hundred sixty-one thousand, five hundred sixty-nine".