573991 has 4 divisors (see below), whose sum is σ = 626184. Its totient is φ = 521800.

The previous prime is 573977. The next prime is 574003. The reversal of 573991 is 199375.

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 573991 - 2⁷ = 573863 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (573901) 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, 26080 + ... + 26101.

It is an arithmetic number, because the mean of its divisors is an integer number (156546).

2⁵⁷³⁹⁹¹ is an apocalyptic number.

573991 is a deficient number, since it is larger than the sum of its proper divisors (52193).

573991 is a wasteful number, since it uses less digits than its factorization.

573991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52192.

The product of its digits is 8505, while the sum is 34.

The square root of 573991 is about 757.6219373804. The cubic root of 573991 is about 83.1065067119.

The spelling of 573991 in words is "five hundred seventy-three thousand, nine hundred ninety-one".