81322427 has 2 divisors, whose sum is σ = 81322428. Its totient is φ = 81322426.

The previous prime is 81322357. The next prime is 81322433. The reversal of 81322427 is 72422318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81322427 - 2¹² = 81318331 is a prime.

It is a super-2 number, since 2×81322427² = 13226674266340658, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81322427.

It is not a weakly prime, because it can be changed into another prime (81022427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40661213 + 40661214.

It is an arithmetic number, because the mean of its divisors is an integer number (40661214).

Almost surely, 2^81322427 is an apocalyptic number.

81322427 is a deficient number, since it is larger than the sum of its proper divisors (1).

81322427 is an equidigital number, since it uses as much as digits as its factorization.

81322427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 29.

The square root of 81322427 is about 9017.8948208548. The cubic root of 81322427 is about 433.2482100383.

The spelling of 81322427 in words is "eighty-one million, three hundred twenty-two thousand, four hundred twenty-seven".