82721227 has 2 divisors, whose sum is σ = 82721228. Its totient is φ = 82721226.

The previous prime is 82721141. The next prime is 82721281. The reversal of 82721227 is 72212728.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82721227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (82821227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41360613 + 41360614.

It is an arithmetic number, because the mean of its divisors is an integer number (41360614).

Almost surely, 2^82721227 is an apocalyptic number.

82721227 is a deficient number, since it is larger than the sum of its proper divisors (1).

82721227 is an equidigital number, since it uses as much as digits as its factorization.

82721227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 31.

The square root of 82721227 is about 9095.1210547194. The cubic root of 82721227 is about 435.7181548958.

The spelling of 82721227 in words is "eighty-two million, seven hundred twenty-one thousand, two hundred twenty-seven".