42545443 has 2 divisors, whose sum is σ = 42545444. Its totient is φ = 42545442.

The previous prime is 42545429. The next prime is 42545453. The reversal of 42545443 is 34454524.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42545443 is a prime.

It is a super-2 number, since 2×42545443² = 3620229440132498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42545453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21272721 + 21272722.

It is an arithmetic number, because the mean of its divisors is an integer number (21272722).

Almost surely, 2^42545443 is an apocalyptic number.

42545443 is a deficient number, since it is larger than the sum of its proper divisors (1).

42545443 is an equidigital number, since it uses as much as digits as its factorization.

42545443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38400, while the sum is 31.

The square root of 42545443 is about 6522.6867930325. The cubic root of 42545443 is about 349.1009387757.

Adding to 42545443 its reverse (34454524), we get a palindrome (76999967).

The spelling of 42545443 in words is "forty-two million, five hundred forty-five thousand, four hundred forty-three".