42691 has 4 divisors (see below), whose sum is σ = 46584. Its totient is φ = 38800.
The previous prime is 42689. The next prime is 42697. The reversal of 42691 is 19624.
42691 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 42691 - 21 = 42689 is a prime.
It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (42697) 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, 1930 + ... + 1951.
It is an arithmetic number, because the mean of its divisors is an integer number (11646).
242691 is an apocalyptic number.
42691 is a deficient number, since it is larger than the sum of its proper divisors (3893).
42691 is a wasteful number, since it uses less digits than its factorization.
42691 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3892.
The product of its digits is 432, while the sum is 22.
The square root of 42691 is about 206.6180050238. The cubic root of 42691 is about 34.9498601785.
The spelling of 42691 in words is "forty-two thousand, six hundred ninety-one".
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