42545729 has 2 divisors, whose sum is σ = 42545730. Its totient is φ = 42545728.

The previous prime is 42545683. The next prime is 42545749. The reversal of 42545729 is 92754524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36881329 + 5664400 = 6073^2 + 2380^2 .

It is a cyclic number.

It is not a de Polignac number, because 42545729 - 2²⁴ = 25768513 is a prime.

It is a super-2 number, since 2×42545729² = 3620278112282882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42545692 and 42545701.

It is not a weakly prime, because it can be changed into another prime (42545749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21272864 + 21272865.

It is an arithmetic number, because the mean of its divisors is an integer number (21272865).

Almost surely, 2^42545729 is an apocalyptic number.

It is an amenable number.

42545729 is a deficient number, since it is larger than the sum of its proper divisors (1).

42545729 is an equidigital number, since it uses as much as digits as its factorization.

42545729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 38.

The square root of 42545729 is about 6522.7087164766. The cubic root of 42545729 is about 349.1017210189.

The spelling of 42545729 in words is "forty-two million, five hundred forty-five thousand, seven hundred twenty-nine".