81941227 has 2 divisors, whose sum is σ = 81941228. Its totient is φ = 81941226.

The previous prime is 81941219. The next prime is 81941231. The reversal of 81941227 is 72214918.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81941227 - 2³ = 81941219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81941192 and 81941201.

It is not a weakly prime, because it can be changed into another prime (81941627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40970613 + 40970614.

It is an arithmetic number, because the mean of its divisors is an integer number (40970614).

Almost surely, 2^81941227 is an apocalyptic number.

81941227 is a deficient number, since it is larger than the sum of its proper divisors (1).

81941227 is an equidigital number, since it uses as much as digits as its factorization.

81941227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 81941227 is about 9052.1393603943. The cubic root of 81941227 is about 434.3443277481.

The spelling of 81941227 in words is "eighty-one million, nine hundred forty-one thousand, two hundred twenty-seven".