81677227 has 2 divisors, whose sum is σ = 81677228. Its totient is φ = 81677226.

The previous prime is 81677213. The next prime is 81677237. The reversal of 81677227 is 72277618.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81677227 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81677227.

It is not a weakly prime, because it can be changed into another prime (81677237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40838613 + 40838614.

It is an arithmetic number, because the mean of its divisors is an integer number (40838614).

Almost surely, 2^81677227 is an apocalyptic number.

81677227 is a deficient number, since it is larger than the sum of its proper divisors (1).

81677227 is an equidigital number, since it uses as much as digits as its factorization.

81677227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65856, while the sum is 40.

The square root of 81677227 is about 9037.5454079081. The cubic root of 81677227 is about 433.8773659470.

The spelling of 81677227 in words is "eighty-one million, six hundred seventy-seven thousand, two hundred twenty-seven".