42561223 has 2 divisors, whose sum is σ = 42561224. Its totient is φ = 42561222.

The previous prime is 42561221. The next prime is 42561289. The reversal of 42561223 is 32216524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42561223 - 2¹ = 42561221 is a prime.

It is a super-2 number, since 2×42561223² = 3622915406511458, which contains 22 as substring.

Together with 42561221, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42561221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21280611 + 21280612.

It is an arithmetic number, because the mean of its divisors is an integer number (21280612).

Almost surely, 2^42561223 is an apocalyptic number.

42561223 is a deficient number, since it is larger than the sum of its proper divisors (1).

42561223 is an equidigital number, since it uses as much as digits as its factorization.

42561223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 25.

The square root of 42561223 is about 6523.8963051232. The cubic root of 42561223 is about 349.1440936669.

Adding to 42561223 its reverse (32216524), we get a palindrome (74777747).

The spelling of 42561223 in words is "forty-two million, five hundred sixty-one thousand, two hundred twenty-three".