18180697 has 2 divisors, whose sum is σ = 18180698. Its totient is φ = 18180696.

The previous prime is 18180689. The next prime is 18180703. The reversal of 18180697 is 79608181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18139081 + 41616 = 4259^2 + 204^2 .

It is an emirp because it is prime and its reverse (79608181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18180697 - 2³ = 18180689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18180647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9090348 + 9090349.

It is an arithmetic number, because the mean of its divisors is an integer number (9090349).

Almost surely, 2^18180697 is an apocalyptic number.

It is an amenable number.

18180697 is a deficient number, since it is larger than the sum of its proper divisors (1).

18180697 is an equidigital number, since it uses as much as digits as its factorization.

18180697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 18180697 is about 4263.8828548636. The cubic root of 18180697 is about 262.9481843108.

The spelling of 18180697 in words is "eighteen million, one hundred eighty thousand, six hundred ninety-seven".