591361 has 3 divisors (see below), whose sum is σ = 592131.
Its totient is φ = 590592.
The previous prime is 591341. The next prime is 591377. The reversal of 591361 is 163195.
The square root of 591361 is 769.
It is a perfect power (a square), and thus also a powerful number.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.
It can be written as a sum of positive squares in only one way, i.e., 231361 + 360000 = 481^2 + 600^2
It is not a de Polignac number, because 591361 - 27 = 591233 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (591301) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 385 + ... + 1153.
It is an arithmetic number, because the mean of its divisors is an integer number (197377).
2591361 is an apocalyptic number.
591361 is the 769-th square number.
591361 is the 385-th centered octagonal number.
It is an amenable number.
591361 is a deficient number, since it is larger than the sum of its proper divisors (770).
591361 is an frugal number, since it uses more digits than its factorization.
591361 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1538 (or 769 counting only the distinct ones).
The product of its digits is 810, while the sum is 25.
The cubic root of 591361 is about 83.9365071976.
Multiplying 591361 by its sum of digits (25), we get a square (14784025 = 38452).
The spelling of 591361 in words is "five hundred ninety-one thousand, three hundred sixty-one".