42131591 has 4 divisors (see below), whose sum is σ = 42170232. Its totient is φ = 42092952.

The previous prime is 42131563. The next prime is 42131597. The reversal of 42131591 is 19513124.

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 42131591 - 2⁶ = 42131527 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 42131591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42131597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17636 + ... + 19881.

It is an arithmetic number, because the mean of its divisors is an integer number (10542558).

Almost surely, 2^42131591 is an apocalyptic number.

42131591 is a deficient number, since it is larger than the sum of its proper divisors (38641).

42131591 is a wasteful number, since it uses less digits than its factorization.

42131591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38640.

The product of its digits is 1080, while the sum is 26.

The square root of 42131591 is about 6490.8852246824. The cubic root of 42131591 is about 347.9653128548.

The spelling of 42131591 in words is "forty-two million, one hundred thirty-one thousand, five hundred ninety-one".