42581171 has 2 divisors, whose sum is σ = 42581172. Its totient is φ = 42581170.

The previous prime is 42581153. The next prime is 42581173. The reversal of 42581171 is 17118524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42581171 - 2¹⁸ = 42319027 is a prime.

It is a super-2 number, since 2×42581171² = 3626312247462482, which contains 22 as substring.

Together with 42581173, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42581173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21290585 + 21290586.

It is an arithmetic number, because the mean of its divisors is an integer number (21290586).

Almost surely, 2^42581171 is an apocalyptic number.

42581171 is a deficient number, since it is larger than the sum of its proper divisors (1).

42581171 is an equidigital number, since it uses as much as digits as its factorization.

42581171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 29.

The square root of 42581171 is about 6525.4249670041. The cubic root of 42581171 is about 349.1986318754.

Adding to 42581171 its reverse (17118524), we get a palindrome (59699695).

The spelling of 42581171 in words is "forty-two million, five hundred eighty-one thousand, one hundred seventy-one".