81280211 has 2 divisors, whose sum is σ = 81280212. Its totient is φ = 81280210.

The previous prime is 81280201. The next prime is 81280219. The reversal of 81280211 is 11208218.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81280211 - 2²⁶ = 14171347 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (81280219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40640105 + 40640106.

It is an arithmetic number, because the mean of its divisors is an integer number (40640106).

Almost surely, 2^81280211 is an apocalyptic number.

81280211 is a deficient number, since it is larger than the sum of its proper divisors (1).

81280211 is an equidigital number, since it uses as much as digits as its factorization.

81280211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 81280211 is about 9015.5538376741. The cubic root of 81280211 is about 433.1732279663.

Adding to 81280211 its reverse (11208218), we get a palindrome (92488429).

The spelling of 81280211 in words is "eighty-one million, two hundred eighty thousand, two hundred eleven".