42222491 has 4 divisors (see below), whose sum is σ = 42235512. Its totient is φ = 42209472.

The previous prime is 42222487. The next prime is 42222533. The reversal of 42222491 is 19422224.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42222491 - 2² = 42222487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42222491.

It is not an unprimeable number, because it can be changed into a prime (42222421) 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 in 3 ways as a sum of consecutive naturals, for example, 2660 + ... + 9566.

It is an arithmetic number, because the mean of its divisors is an integer number (10558878).

Almost surely, 2^42222491 is an apocalyptic number.

42222491 is a deficient number, since it is larger than the sum of its proper divisors (13021).

42222491 is an equidigital number, since it uses as much as digits as its factorization.

42222491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13020.

The product of its digits is 2304, while the sum is 26.

The square root of 42222491 is about 6497.8835785200. The cubic root of 42222491 is about 348.2153811596.

The spelling of 42222491 in words is "forty-two million, two hundred twenty-two thousand, four hundred ninety-one".