81227687 has 2 divisors, whose sum is σ = 81227688. Its totient is φ = 81227686.

The previous prime is 81227669. The next prime is 81227689. The reversal of 81227687 is 78672218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81227687 - 2⁶ = 81227623 is a prime.

Together with 81227689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81227689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40613843 + 40613844.

It is an arithmetic number, because the mean of its divisors is an integer number (40613844).

Almost surely, 2^81227687 is an apocalyptic number.

81227687 is a deficient number, since it is larger than the sum of its proper divisors (1).

81227687 is an equidigital number, since it uses as much as digits as its factorization.

81227687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 41.

The square root of 81227687 is about 9012.6404011255. The cubic root of 81227687 is about 433.0799010545.

The spelling of 81227687 in words is "eighty-one million, two hundred twenty-seven thousand, six hundred eighty-seven".