531091 has 4 divisors (see below), whose sum is σ = 579384. Its totient is φ = 482800.

The previous prime is 531079. The next prime is 531101. The reversal of 531091 is 190135.

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 531091 - 2¹¹ = 529043 is a prime.

It is a Duffinian number.

531091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (531071) 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, 24130 + ... + 24151.

It is an arithmetic number, because the mean of its divisors is an integer number (144846).

2⁵³¹⁰⁹¹ is an apocalyptic number.

531091 is a deficient number, since it is larger than the sum of its proper divisors (48293).

531091 is a wasteful number, since it uses less digits than its factorization.

531091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48292.

The product of its (nonzero) digits is 135, while the sum is 19.

The square root of 531091 is about 728.7599055931. The cubic root of 531091 is about 80.9822142527.

The spelling of 531091 in words is "five hundred thirty-one thousand, ninety-one".