18122077 has 2 divisors, whose sum is σ = 18122078.
Its totient is φ = 18122076.
The previous prime is 18122059. The next prime is 18122087. The reversal of 18122077 is 77022181.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 18071001 + 51076 = 4251^2 + 226^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-18122077 is a prime.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (18122057) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061038 + 9061039.
It is an arithmetic number, because the mean of its divisors is an integer number (9061039).
Almost surely, 218122077 is an apocalyptic number.
It is an amenable number.
18122077 is a deficient number, since it is larger than the sum of its proper divisors (1).
18122077 is an equidigital number, since it uses as much as digits as its factorization.
18122077 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 1568, while the sum is 28.
The square root of 18122077 is about 4257.0032886997.
The cubic root of 18122077 is about 262.6652721875.
Subtracting from 18122077 its sum of digits (28), we obtain a square (18122049 = 42572).
The spelling of 18122077 in words is "eighteen million, one hundred twenty-two thousand, seventy-seven".