81322097 has 2 divisors, whose sum is σ = 81322098. Its totient is φ = 81322096.

The previous prime is 81322063. The next prime is 81322099. The reversal of 81322097 is 79022318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73119601 + 8202496 = 8551^2 + 2864^2 .

It is a cyclic number.

It is not a de Polignac number, because 81322097 - 2²⁰ = 80273521 is a prime.

It is a super-2 number, since 2×81322097² = 13226566920954818, which contains 22 as substring.

Together with 81322099, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81322099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40661048 + 40661049.

It is an arithmetic number, because the mean of its divisors is an integer number (40661049).

Almost surely, 2^81322097 is an apocalyptic number.

It is an amenable number.

81322097 is a deficient number, since it is larger than the sum of its proper divisors (1).

81322097 is an equidigital number, since it uses as much as digits as its factorization.

81322097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 81322097 is about 9017.8765238830. The cubic root of 81322097 is about 433.2476240085.

The spelling of 81322097 in words is "eighty-one million, three hundred twenty-two thousand, ninety-seven".