81349227 has 12 divisors (see below), whose sum is σ = 117621504. Its totient is φ = 54178800.

The previous prime is 81349217. The next prime is 81349237. The reversal of 81349227 is 72294318.

It is an interprime number because it is at equal distance from previous prime (81349217) and next prime (81349237).

It is not a de Polignac number, because 81349227 - 2¹⁰ = 81348203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81349191 and 81349200.

It is not an unprimeable number, because it can be changed into a prime (81349217) 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, 6433 + ... + 14285.

It is an arithmetic number, because the mean of its divisors is an integer number (9801792).

Almost surely, 2^81349227 is an apocalyptic number.

81349227 is a deficient number, since it is larger than the sum of its proper divisors (36272277).

81349227 is a wasteful number, since it uses less digits than its factorization.

81349227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9010 (or 9007 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 81349227 is about 9019.3806328373. The cubic root of 81349227 is about 433.2957974719.

The spelling of 81349227 in words is "eighty-one million, three hundred forty-nine thousand, two hundred twenty-seven".