42163861 has 4 divisors (see below), whose sum is σ = 42178752. Its totient is φ = 42148972.

The previous prime is 42163829. The next prime is 42163879. The reversal of 42163861 is 16836124.

It is a happy number.

42163861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42163861 - 2⁵ = 42163829 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42163811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1741 + ... + 9346.

It is an arithmetic number, because the mean of its divisors is an integer number (10544688).

Almost surely, 2^42163861 is an apocalyptic number.

It is an amenable number.

42163861 is a deficient number, since it is larger than the sum of its proper divisors (14891).

42163861 is a wasteful number, since it uses less digits than its factorization.

42163861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14890.

The product of its digits is 6912, while the sum is 31.

The square root of 42163861 is about 6493.3705423301. The cubic root of 42163861 is about 348.0541296211.

Adding to 42163861 its reverse (16836124), we get a palindrome (58999985).

The spelling of 42163861 in words is "forty-two million, one hundred sixty-three thousand, eight hundred sixty-one".