42215545 has 4 divisors (see below), whose sum is σ = 50658660. Its totient is φ = 33772432.

The previous prime is 42215531. The next prime is 42215581. The reversal of 42215545 is 54551224.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5103081 + 37112464 = 2259^2 + 6092^2 .

It is a cyclic number.

It is not a de Polignac number, because 42215545 - 2⁵ = 42215513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4221550 + ... + 4221559.

It is an arithmetic number, because the mean of its divisors is an integer number (12664665).

Almost surely, 2^42215545 is an apocalyptic number.

It is an amenable number.

42215545 is a deficient number, since it is larger than the sum of its proper divisors (8443115).

42215545 is an equidigital number, since it uses as much as digits as its factorization.

42215545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8443114.

The product of its digits is 8000, while the sum is 28.

The square root of 42215545 is about 6497.3490748151. The cubic root of 42215545 is about 348.1962852021.

Adding to 42215545 its reverse (54551224), we get a palindrome (96766769).

The spelling of 42215545 in words is "forty-two million, two hundred fifteen thousand, five hundred forty-five".