81468231 has 16 divisors (see below), whose sum is σ = 122067456. Its totient is φ = 47954016.

The previous prime is 81468227. The next prime is 81468239. The reversal of 81468231 is 13286418.

It is not a de Polignac number, because 81468231 - 2² = 81468227 is a prime.

It is a super-2 number, since 2×81468231² = 13274145324538722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81468192 and 81468201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81468239) 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, 44515 + ... + 46308.

It is an arithmetic number, because the mean of its divisors is an integer number (7629216).

Almost surely, 2^81468231 is an apocalyptic number.

81468231 is a deficient number, since it is larger than the sum of its proper divisors (40599225).

81468231 is a wasteful number, since it uses less digits than its factorization.

81468231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90862.

The product of its digits is 9216, while the sum is 33.

The square root of 81468231 is about 9025.9753489581. The cubic root of 81468231 is about 433.5069808332.

The spelling of 81468231 in words is "eighty-one million, four hundred sixty-eight thousand, two hundred thirty-one".