591631 has 4 divisors (see below), whose sum is σ = 599200. Its totient is φ = 584064.

The previous prime is 591623. The next prime is 591649. The reversal of 591631 is 136195.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136195 = 5 ⋅27239.

It is a 7-Lehmer number, since φ(591631) divides (591631-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 591631 - 2³ = 591623 is a prime.

It is a super-2 number, since 2×591631² = 700054480322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 591596 and 591605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (591601) 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, 3666 + ... + 3823.

It is an arithmetic number, because the mean of its divisors is an integer number (149800).

2⁵⁹¹⁶³¹ is an apocalyptic number.

591631 is a deficient number, since it is larger than the sum of its proper divisors (7569).

591631 is an equidigital number, since it uses as much as digits as its factorization.

591631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7568.

The product of its digits is 810, while the sum is 25.

The square root of 591631 is about 769.1755326322. The cubic root of 591631 is about 83.9492796602.

The spelling of 591631 in words is "five hundred ninety-one thousand, six hundred thirty-one".