42578113 has 2 divisors, whose sum is σ = 42578114. Its totient is φ = 42578112.

The previous prime is 42578111. The next prime is 42578143. The reversal of 42578113 is 31187524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26801329 + 15776784 = 5177^2 + 3972^2 .

It is a cyclic number.

It is not a de Polignac number, because 42578113 - 2¹ = 42578111 is a prime.

Together with 42578111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42578111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21289056 + 21289057.

It is an arithmetic number, because the mean of its divisors is an integer number (21289057).

Almost surely, 2^42578113 is an apocalyptic number.

It is an amenable number.

42578113 is a deficient number, since it is larger than the sum of its proper divisors (1).

42578113 is an equidigital number, since it uses as much as digits as its factorization.

42578113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

The square root of 42578113 is about 6525.1906485558. The cubic root of 42578113 is about 349.1902723513.

The spelling of 42578113 in words is "forty-two million, five hundred seventy-eight thousand, one hundred thirteen".