18141997 has 2 divisors, whose sum is σ = 18141998. Its totient is φ = 18141996.

The previous prime is 18141989. The next prime is 18142021. The reversal of 18141997 is 79914181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18139081 + 2916 = 4259^2 + 54^2 .

It is an emirp because it is prime and its reverse (79914181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18141997 - 2³ = 18141989 is a prime.

It is a super-3 number, since 3×18141997³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18141947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9070998 + 9070999.

It is an arithmetic number, because the mean of its divisors is an integer number (9070999).

Almost surely, 2^18141997 is an apocalyptic number.

It is an amenable number.

18141997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18141997 is an equidigital number, since it uses as much as digits as its factorization.

18141997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 40.

The square root of 18141997 is about 4259.3423201241. The cubic root of 18141997 is about 262.7614785303.

The spelling of 18141997 in words is "eighteen million, one hundred forty-one thousand, nine hundred ninety-seven".