42812091 has 64 divisors (see below), whose sum is σ = 76723200. Its totient is φ = 23079168.

The previous prime is 42812059. The next prime is 42812093. The reversal of 42812091 is 19021824.

42812091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42812091 - 2⁵ = 42812059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (42812093) 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 63 ways as a sum of consecutive naturals, for example, 400060 + ... + 400166.

It is an arithmetic number, because the mean of its divisors is an integer number (1198800).

Almost surely, 2^42812091 is an apocalyptic number.

42812091 is a deficient number, since it is larger than the sum of its proper divisors (33911109).

42812091 is a wasteful number, since it uses less digits than its factorization.

42812091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 42812091 is about 6543.0949099031. The cubic root of 42812091 is about 349.8287352567.

The spelling of 42812091 in words is "forty-two million, eight hundred twelve thousand, ninety-one".