42878101 has 4 divisors (see below), whose sum is σ = 49003552. Its totient is φ = 36752652.

The previous prime is 42878089. The next prime is 42878149. The reversal of 42878101 is 10187824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42878101 - 2¹⁹ = 42353813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42878201) 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, 3062715 + ... + 3062728.

It is an arithmetic number, because the mean of its divisors is an integer number (12250888).

Almost surely, 2^42878101 is an apocalyptic number.

It is an amenable number.

42878101 is a deficient number, since it is larger than the sum of its proper divisors (6125451).

42878101 is an equidigital number, since it uses as much as digits as its factorization.

42878101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6125450.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 42878101 is about 6548.1372160333. The cubic root of 42878101 is about 350.0084378918.

The spelling of 42878101 in words is "forty-two million, eight hundred seventy-eight thousand, one hundred one".