81336227 has 12 divisors (see below), whose sum is σ = 94768200. Its totient is φ = 69604416.

The previous prime is 81336223. The next prime is 81336239. The reversal of 81336227 is 72263318.

It is a happy number.

It is not a de Polignac number, because 81336227 - 2² = 81336223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81336193 and 81336202.

It is not an unprimeable number, because it can be changed into a prime (81336223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47024 + ... + 48722.

It is an arithmetic number, because the mean of its divisors is an integer number (7897350).

Almost surely, 2^81336227 is an apocalyptic number.

81336227 is a deficient number, since it is larger than the sum of its proper divisors (13431973).

81336227 is a wasteful number, since it uses less digits than its factorization.

81336227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690 (or 2683 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 81336227 is about 9018.6599337152. The cubic root of 81336227 is about 433.2727153208.

The spelling of 81336227 in words is "eighty-one million, three hundred thirty-six thousand, two hundred twenty-seven".