81180097 has 2 divisors, whose sum is σ = 81180098. Its totient is φ = 81180096.

The previous prime is 81180089. The next prime is 81180101. The reversal of 81180097 is 79008118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49999041 + 31181056 = 7071^2 + 5584^2 .

It is a cyclic number.

It is not a de Polignac number, because 81180097 - 2³ = 81180089 is a prime.

It is not a weakly prime, because it can be changed into another prime (81180007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40590048 + 40590049.

It is an arithmetic number, because the mean of its divisors is an integer number (40590049).

Almost surely, 2^81180097 is an apocalyptic number.

It is an amenable number.

81180097 is a deficient number, since it is larger than the sum of its proper divisors (1).

81180097 is an equidigital number, since it uses as much as digits as its factorization.

81180097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 81180097 is about 9009.9998335183. Note that the first 3 decimals coincide. The cubic root of 81180097 is about 432.9953063404.

It can be divided in two parts, 811 and 80097, that added together give a palindrome (80908).

The spelling of 81180097 in words is "eighty-one million, one hundred eighty thousand, ninety-seven".