42947591 has 4 divisors (see below), whose sum is σ = 43071000. Its totient is φ = 42824184.

The previous prime is 42947539. The next prime is 42947609. The reversal of 42947591 is 19574924.

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 42947591 - 2¹⁰ = 42946567 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 (42940591) 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, 61181 + ... + 61878.

It is an arithmetic number, because the mean of its divisors is an integer number (10767750).

Almost surely, 2^42947591 is an apocalyptic number.

42947591 is a deficient number, since it is larger than the sum of its proper divisors (123409).

42947591 is a wasteful number, since it uses less digits than its factorization.

42947591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123408.

The product of its digits is 90720, while the sum is 41.

The square root of 42947591 is about 6553.4411571326. The cubic root of 42947591 is about 350.1974151590.

The spelling of 42947591 in words is "forty-two million, nine hundred forty-seven thousand, five hundred ninety-one".