18601321 has 2 divisors, whose sum is σ = 18601322. Its totient is φ = 18601320.

The previous prime is 18601313. The next prime is 18601409. The reversal of 18601321 is 12310681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13402921 + 5198400 = 3661^2 + 2280^2 .

It is a cyclic number.

It is not a de Polignac number, because 18601321 - 2³ = 18601313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18601292 and 18601301.

It is not a weakly prime, because it can be changed into another prime (18601301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9300660 + 9300661.

It is an arithmetic number, because the mean of its divisors is an integer number (9300661).

Almost surely, 2^18601321 is an apocalyptic number.

It is an amenable number.

18601321 is a deficient number, since it is larger than the sum of its proper divisors (1).

18601321 is an equidigital number, since it uses as much as digits as its factorization.

18601321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 18601321 is about 4312.9248776208. The cubic root of 18601321 is about 264.9605779734.

The spelling of 18601321 in words is "eighteen million, six hundred one thousand, three hundred twenty-one".