591551 has 4 divisors (see below), whose sum is σ = 605352. Its totient is φ = 577752.

The previous prime is 591523. The next prime is 591553. The reversal of 591551 is 155195.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155195 = 5 ⋅31039.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-591551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 591551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (591553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6836 + ... + 6921.

It is an arithmetic number, because the mean of its divisors is an integer number (151338).

2⁵⁹¹⁵⁵¹ is an apocalyptic number.

591551 is a deficient number, since it is larger than the sum of its proper divisors (13801).

591551 is a wasteful number, since it uses less digits than its factorization.

591551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13800.

The product of its digits is 1125, while the sum is 26.

The square root of 591551 is about 769.1235271398. The cubic root of 591551 is about 83.9454956320.

The spelling of 591551 in words is "five hundred ninety-one thousand, five hundred fifty-one".