2231631591 has 16 divisors (see below), whose sum is σ = 3401380608. Its totient is φ = 1274918400.

The previous prime is 2231631569. The next prime is 2231631617. The reversal of 2231631591 is 1951361322.

It is not a de Polignac number, because 2231631591 - 2¹⁴ = 2231615207 is a prime.

It is a super-3 number, since 3×2231631591³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231631791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104496 + ... + 124026.

It is an arithmetic number, because the mean of its divisors is an integer number (212586288).

Almost surely, 2^2231631591 is an apocalyptic number.

2231631591 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2231631591 is a deficient number, since it is larger than the sum of its proper divisors (1169749017).

2231631591 is a wasteful number, since it uses less digits than its factorization.

2231631591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24982.

The product of its digits is 9720, while the sum is 33.

The square root of 2231631591 is about 47240.1480840185. The cubic root of 2231631591 is about 1306.7951085982.

The spelling of 2231631591 in words is "two billion, two hundred thirty-one million, six hundred thirty-one thousand, five hundred ninety-one".