18120797 has 2 divisors, whose sum is σ = 18120798. Its totient is φ = 18120796.

The previous prime is 18120779. The next prime is 18120799. The reversal of 18120797 is 79702181.

Together with previous prime (18120779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14830201 + 3290596 = 3851^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 18120797 - 2⁶ = 18120733 is a prime.

Together with 18120799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18120799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9060398 + 9060399.

It is an arithmetic number, because the mean of its divisors is an integer number (9060399).

Almost surely, 2^18120797 is an apocalyptic number.

It is an amenable number.

18120797 is a deficient number, since it is larger than the sum of its proper divisors (1).

18120797 is an equidigital number, since it uses as much as digits as its factorization.

18120797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 18120797 is about 4256.8529455456. The cubic root of 18120797 is about 262.6590878437.

The spelling of 18120797 in words is "eighteen million, one hundred twenty thousand, seven hundred ninety-seven".