42042569 has 2 divisors, whose sum is σ = 42042570. Its totient is φ = 42042568.

The previous prime is 42042557. The next prime is 42042587. The reversal of 42042569 is 96524024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38278969 + 3763600 = 6187^2 + 1940^2 .

It is a cyclic number.

It is not a de Polignac number, because 42042569 - 2⁸ = 42042313 is a prime.

It is a super-2 number, since 2×42042569² = 3535155216239522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42042509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21021284 + 21021285.

It is an arithmetic number, because the mean of its divisors is an integer number (21021285).

Almost surely, 2^42042569 is an apocalyptic number.

It is an amenable number.

42042569 is a deficient number, since it is larger than the sum of its proper divisors (1).

42042569 is an equidigital number, since it uses as much as digits as its factorization.

42042569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 42042569 is about 6484.0241362907. The cubic root of 42042569 is about 347.7200621192.

The spelling of 42042569 in words is "forty-two million, forty-two thousand, five hundred sixty-nine".