42288581 has 4 divisors (see below), whose sum is σ = 42326412. Its totient is φ = 42250752.

The previous prime is 42288577. The next prime is 42288593. The reversal of 42288581 is 18588224.

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 38328481 + 3960100 = 6191^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 42288581 - 2² = 42288577 is a prime.

It is a super-2 number, since 2×42288581² = 3576648165987122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42288481) 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, 17186 + ... + 19491.

It is an arithmetic number, because the mean of its divisors is an integer number (10581603).

Almost surely, 2^42288581 is an apocalyptic number.

It is an amenable number.

42288581 is a deficient number, since it is larger than the sum of its proper divisors (37831).

42288581 is a wasteful number, since it uses less digits than its factorization.

42288581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37830.

The product of its digits is 40960, while the sum is 38.

The square root of 42288581 is about 6502.9670920281. The cubic root of 42288581 is about 348.3969712464.

The spelling of 42288581 in words is "forty-two million, two hundred eighty-eight thousand, five hundred eighty-one".