81066231 has 8 divisors (see below), whose sum is σ = 120098160. Its totient is φ = 54044136.

The previous prime is 81066221. The next prime is 81066233. The reversal of 81066231 is 13266018.

It is not a de Polignac number, because 81066231 - 2¹⁰ = 81065207 is a prime.

It is a super-2 number, since 2×81066231² = 13143467617090722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 3002453 = 81066231 / (8 + 1 + 0 + 6 + 6 + 2 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 81066195 and 81066204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81066233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1501200 + ... + 1501253.

It is an arithmetic number, because the mean of its divisors is an integer number (15012270).

Almost surely, 2^81066231 is an apocalyptic number.

81066231 is a deficient number, since it is larger than the sum of its proper divisors (39031929).

81066231 is a wasteful number, since it uses less digits than its factorization.

81066231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3002462 (or 3002456 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 81066231 is about 9003.6787481562. The cubic root of 81066231 is about 432.7927669048.

The spelling of 81066231 in words is "eighty-one million, sixty-six thousand, two hundred thirty-one".