523391 has 4 divisors (see below), whose sum is σ = 570984. Its totient is φ = 475800.

The previous prime is 523387. The next prime is 523403. The reversal of 523391 is 193325.

It is a happy number.

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 523391 - 2² = 523387 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523351) 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, 23780 + ... + 23801.

It is an arithmetic number, because the mean of its divisors is an integer number (142746).

2⁵²³³⁹¹ is an apocalyptic number.

523391 is a deficient number, since it is larger than the sum of its proper divisors (47593).

523391 is a wasteful number, since it uses less digits than its factorization.

523391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47592.

The product of its digits is 810, while the sum is 23.

The square root of 523391 is about 723.4576698052. The cubic root of 523391 is about 80.5889350548.

It can be divided in two parts, 52 and 3391, that added together give a palindrome (3443).

The spelling of 523391 in words is "five hundred twenty-three thousand, three hundred ninety-one".