42543617 has 2 divisors, whose sum is σ = 42543618. Its totient is φ = 42543616.

The previous prime is 42543581. The next prime is 42543623. The reversal of 42543617 is 71634524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30426256 + 12117361 = 5516^2 + 3481^2 .

It is a cyclic number.

It is not a de Polignac number, because 42543617 - 2¹² = 42539521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42543637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21271808 + 21271809.

It is an arithmetic number, because the mean of its divisors is an integer number (21271809).

Almost surely, 2^42543617 is an apocalyptic number.

It is an amenable number.

42543617 is a deficient number, since it is larger than the sum of its proper divisors (1).

42543617 is an equidigital number, since it uses as much as digits as its factorization.

42543617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 32.

The square root of 42543617 is about 6522.5468185365. The cubic root of 42543617 is about 349.0959443714.

The spelling of 42543617 in words is "forty-two million, five hundred forty-three thousand, six hundred seventeen".