83561231 has 16 divisors (see below), whose sum is σ = 95691456. Its totient is φ = 72374016.

The previous prime is 83561201. The next prime is 83561243. The reversal of 83561231 is 13216538.

It is not a de Polignac number, because 83561231 - 2¹⁴ = 83544847 is a prime.

It is a super-2 number, since 2×83561231² = 13964958652470722, 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 = 83561194 and 83561203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83561201) 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, 13211 + ... + 18483.

It is an arithmetic number, because the mean of its divisors is an integer number (5980716).

Almost surely, 2^83561231 is an apocalyptic number.

83561231 is a deficient number, since it is larger than the sum of its proper divisors (12130225).

83561231 is a wasteful number, since it uses less digits than its factorization.

83561231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5362.

The product of its digits is 4320, while the sum is 29.

The square root of 83561231 is about 9141.1832385091. The cubic root of 83561231 is about 437.1880438461.

Adding to 83561231 its reverse (13216538), we get a palindrome (96777769).

The spelling of 83561231 in words is "eighty-three million, five hundred sixty-one thousand, two hundred thirty-one".