42556897 has 4 divisors (see below), whose sum is σ = 42620436. Its totient is φ = 42493360.

The previous prime is 42556889. The next prime is 42556909. The reversal of 42556897 is 79865524.

42556897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42003361 + 553536 = 6481^2 + 744^2 .

It is a cyclic number.

It is not a de Polignac number, because 42556897 - 2³ = 42556889 is a prime.

It is a super-2 number, since 2×42556897² = 3622178964537218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42556847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30754 + ... + 32107.

It is an arithmetic number, because the mean of its divisors is an integer number (10655109).

Almost surely, 2^42556897 is an apocalyptic number.

It is an amenable number.

42556897 is a deficient number, since it is larger than the sum of its proper divisors (63539).

42556897 is an equidigital number, since it uses as much as digits as its factorization.

42556897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63538.

The product of its digits is 604800, while the sum is 46.

The square root of 42556897 is about 6523.5647463638. The cubic root of 42556897 is about 349.1322640528.

The spelling of 42556897 in words is "forty-two million, five hundred fifty-six thousand, eight hundred ninety-seven".