18608861 has 2 divisors, whose sum is σ = 18608862. Its totient is φ = 18608860.

The previous prime is 18608833. The next prime is 18608881. The reversal of 18608861 is 16880681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18576100 + 32761 = 4310^2 + 181^2 .

It is an emirp because it is prime and its reverse (16880681) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 19880981 and 18908891.

It is a cyclic number.

It is not a de Polignac number, because 18608861 - 2⁶ = 18608797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18608801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9304430 + 9304431.

It is an arithmetic number, because the mean of its divisors is an integer number (9304431).

Almost surely, 2^18608861 is an apocalyptic number.

It is an amenable number.

18608861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18608861 is an equidigital number, since it uses as much as digits as its factorization.

18608861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 18608861 is about 4313.7989058369. The cubic root of 18608861 is about 264.9963735115.

The spelling of 18608861 in words is "eighteen million, six hundred eight thousand, eight hundred sixty-one".