18497489 has 2 divisors, whose sum is σ = 18497490. Its totient is φ = 18497488.

The previous prime is 18497467. The next prime is 18497491. The reversal of 18497489 is 98479481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17497489 + 1000000 = 4183^2 + 1000^2 .

It is a cyclic number.

It is not a de Polignac number, because 18497489 - 2⁸ = 18497233 is a prime.

Together with 18497491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18497419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9248744 + 9248745.

It is an arithmetic number, because the mean of its divisors is an integer number (9248745).

Almost surely, 2^18497489 is an apocalyptic number.

It is an amenable number.

18497489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18497489 is an equidigital number, since it uses as much as digits as its factorization.

18497489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The square root of 18497489 is about 4300.8707257950. The cubic root of 18497489 is about 264.4666572226.

The spelling of 18497489 in words is "eighteen million, four hundred ninety-seven thousand, four hundred eighty-nine".