81227669 has 2 divisors, whose sum is σ = 81227670. Its totient is φ = 81227668.

The previous prime is 81227639. The next prime is 81227687. The reversal of 81227669 is 96672218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42315025 + 38912644 = 6505^2 + 6238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81227669 is a prime.

It is a super-2 number, since 2×81227669² = 13195868422347122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81227639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40613834 + 40613835.

It is an arithmetic number, because the mean of its divisors is an integer number (40613835).

Almost surely, 2^81227669 is an apocalyptic number.

It is an amenable number.

81227669 is a deficient number, since it is larger than the sum of its proper divisors (1).

81227669 is an equidigital number, since it uses as much as digits as its factorization.

81227669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 81227669 is about 9012.6394025280. The cubic root of 81227669 is about 433.0798690645.

The spelling of 81227669 in words is "eighty-one million, two hundred twenty-seven thousand, six hundred sixty-nine".