42563881 has 2 divisors, whose sum is σ = 42563882. Its totient is φ = 42563880.

The previous prime is 42563879. The next prime is 42563893. The reversal of 42563881 is 18836524.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42458256 + 105625 = 6516^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 42563881 - 2¹ = 42563879 is a prime.

It is a super-2 number, since 2×42563881² = 3623367931564322, which contains 22 as substring.

Together with 42563879, 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 42563881.

It is not a weakly prime, because it can be changed into another prime (42563821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21281940 + 21281941.

It is an arithmetic number, because the mean of its divisors is an integer number (21281941).

Almost surely, 2^42563881 is an apocalyptic number.

It is an amenable number.

42563881 is a deficient number, since it is larger than the sum of its proper divisors (1).

42563881 is an equidigital number, since it uses as much as digits as its factorization.

42563881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 37.

The square root of 42563881 is about 6524.1000145614. The cubic root of 42563881 is about 349.1513616730.

The spelling of 42563881 in words is "forty-two million, five hundred sixty-three thousand, eight hundred eighty-one".