42216577 has 4 divisors (see below), whose sum is σ = 45464020. Its totient is φ = 38969136.

The previous prime is 42216541. The next prime is 42216589. The reversal of 42216577 is 77561224.

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 28901376 + 13315201 = 5376^2 + 3649^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42216577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42216277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1623702 + ... + 1623727.

It is an arithmetic number, because the mean of its divisors is an integer number (11366005).

Almost surely, 2^42216577 is an apocalyptic number.

It is an amenable number.

42216577 is a deficient number, since it is larger than the sum of its proper divisors (3247443).

42216577 is a wasteful number, since it uses less digits than its factorization.

42216577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3247442.

The product of its digits is 23520, while the sum is 34.

The square root of 42216577 is about 6497.4284913341. The cubic root of 42216577 is about 348.1991225111.

The spelling of 42216577 in words is "forty-two million, two hundred sixteen thousand, five hundred seventy-seven".