42591287 has 4 divisors (see below), whose sum is σ = 42644616. Its totient is φ = 42537960.

The previous prime is 42591271. The next prime is 42591299. The reversal of 42591287 is 78219524.

42591287 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 is a cyclic number.

It is not a de Polignac number, because 42591287 - 2⁴ = 42591271 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42591287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42591247) 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, 25448 + ... + 27069.

It is an arithmetic number, because the mean of its divisors is an integer number (10661154).

Almost surely, 2^42591287 is an apocalyptic number.

42591287 is a deficient number, since it is larger than the sum of its proper divisors (53329).

42591287 is an equidigital number, since it uses as much as digits as its factorization.

42591287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53328.

The product of its digits is 40320, while the sum is 38.

The square root of 42591287 is about 6526.2000429040. The cubic root of 42591287 is about 349.2262827015.

The spelling of 42591287 in words is "forty-two million, five hundred ninety-one thousand, two hundred eighty-seven".