18081097 has 2 divisors, whose sum is σ = 18081098. Its totient is φ = 18081096.

The previous prime is 18081083. The next prime is 18081131. The reversal of 18081097 is 79018081.

It is an a-pointer prime, because the next prime (18081131) can be obtained adding 18081097 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16516096 + 1565001 = 4064^2 + 1251^2 .

It is an emirp because it is prime and its reverse (79018081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18081097 is a prime.

It is not a weakly prime, because it can be changed into another prime (18084097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9040548 + 9040549.

It is an arithmetic number, because the mean of its divisors is an integer number (9040549).

Almost surely, 2^18081097 is an apocalyptic number.

It is an amenable number.

18081097 is a deficient number, since it is larger than the sum of its proper divisors (1).

18081097 is an equidigital number, since it uses as much as digits as its factorization.

18081097 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 18081097 is about 4252.1873194863. The cubic root of 18081097 is about 262.4671317879.

The spelling of 18081097 in words is "eighteen million, eighty-one thousand, ninety-seven".