42418531 has 2 divisors, whose sum is σ = 42418532. Its totient is φ = 42418530.

The previous prime is 42418529. The next prime is 42418547. The reversal of 42418531 is 13581424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42418531 - 2¹ = 42418529 is a prime.

It is a super-2 number, since 2×42418531² = 3598663544395922, which contains 22 as substring.

Together with 42418529, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 42418531.

It is not a weakly prime, because it can be changed into another prime (42418031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21209265 + 21209266.

It is an arithmetic number, because the mean of its divisors is an integer number (21209266).

Almost surely, 2^42418531 is an apocalyptic number.

42418531 is a deficient number, since it is larger than the sum of its proper divisors (1).

42418531 is an equidigital number, since it uses as much as digits as its factorization.

42418531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 28.

The square root of 42418531 is about 6512.9510208507. The cubic root of 42418531 is about 348.7534732421.

Adding to 42418531 its reverse (13581424), we get a palindrome (55999955).

The spelling of 42418531 in words is "forty-two million, four hundred eighteen thousand, five hundred thirty-one".