81342231 has 8 divisors (see below), whose sum is σ = 109451760. Its totient is φ = 53730432.

The previous prime is 81342181. The next prime is 81342253. The reversal of 81342231 is 13224318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81342231 - 2¹¹ = 81340183 is a prime.

It is a super-2 number, since 2×81342231² = 13233117088114722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81342031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124050 + ... + 124703.

It is an arithmetic number, because the mean of its divisors is an integer number (13681470).

Almost surely, 2^81342231 is an apocalyptic number.

81342231 is a deficient number, since it is larger than the sum of its proper divisors (28109529).

81342231 is a wasteful number, since it uses less digits than its factorization.

81342231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248865.

The product of its digits is 1152, while the sum is 24.

The square root of 81342231 is about 9018.9927929897. The cubic root of 81342231 is about 433.2833760291.

Adding to 81342231 its reverse (13224318), we get a palindrome (94566549).

The spelling of 81342231 in words is "eighty-one million, three hundred forty-two thousand, two hundred thirty-one".