42861591 has 6 divisors (see below), whose sum is σ = 61911200. Its totient is φ = 28574388.

The previous prime is 42861569. The next prime is 42861601. The reversal of 42861591 is 19516824.

42861591 is a `hidden beast` number, since 4 + 2 + 8 + 61 + 591 = 666.

It is not a de Polignac number, because 42861591 - 2⁶ = 42861527 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 (42861491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2381191 + ... + 2381208.

Almost surely, 2^42861591 is an apocalyptic number.

42861591 is a deficient number, since it is larger than the sum of its proper divisors (19049609).

42861591 is a wasteful number, since it uses less digits than its factorization.

42861591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4762405 (or 4762402 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 42861591 is about 6546.8764307874. The cubic root of 42861591 is about 349.9635091208.

The spelling of 42861591 in words is "forty-two million, eight hundred sixty-one thousand, five hundred ninety-one".