18601489 has 2 divisors, whose sum is σ = 18601490. Its totient is φ = 18601488.

The previous prime is 18601487. The next prime is 18601493. The reversal of 18601489 is 98410681.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14500864 + 4100625 = 3808^2 + 2025^2 .

It is a cyclic number.

It is not a de Polignac number, because 18601489 - 2¹ = 18601487 is a prime.

Together with 18601487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18601481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9300744 + 9300745.

It is an arithmetic number, because the mean of its divisors is an integer number (9300745).

Almost surely, 2^18601489 is an apocalyptic number.

It is an amenable number.

18601489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18601489 is an equidigital number, since it uses as much as digits as its factorization.

18601489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18601489 is about 4312.9443539188. The cubic root of 18601489 is about 264.9613756452.

The spelling of 18601489 in words is "eighteen million, six hundred one thousand, four hundred eighty-nine".