42544213 has 4 divisors (see below), whose sum is σ = 43346988. Its totient is φ = 41741440.

The previous prime is 42544207. The next prime is 42544219. The reversal of 42544213 is 31244524.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (42544207) and next prime (42544219).

It can be written as a sum of positive squares in 2 ways, for example, as 25180324 + 17363889 = 5018^2 + 4167^2 .

It is a cyclic number.

It is not a de Polignac number, because 42544213 - 2⁹ = 42543701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42544219) 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, 401308 + ... + 401413.

It is an arithmetic number, because the mean of its divisors is an integer number (10836747).

Almost surely, 2^42544213 is an apocalyptic number.

It is an amenable number.

42544213 is a deficient number, since it is larger than the sum of its proper divisors (802775).

42544213 is an equidigital number, since it uses as much as digits as its factorization.

42544213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802774.

The product of its digits is 3840, while the sum is 25.

The square root of 42544213 is about 6522.5925060516. The cubic root of 42544213 is about 349.0975745432.

Adding to 42544213 its reverse (31244524), we get a palindrome (73788737).

The spelling of 42544213 in words is "forty-two million, five hundred forty-four thousand, two hundred thirteen".