18608881 has 2 divisors, whose sum is σ = 18608882. Its totient is φ = 18608880.

The previous prime is 18608861. The next prime is 18608899. The reversal of 18608881 is 18880681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16128256 + 2480625 = 4016^2 + 1575^2 .

It is a cyclic number.

It is not a de Polignac number, because 18608881 - 2⁷ = 18608753 is a prime.

It is a super-2 number, since 2×18608881² = 692580904144322, which contains 22 as substring.

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, 9304440 + 9304441.

It is an arithmetic number, because the mean of its divisors is an integer number (9304441).

Almost surely, 2^18608881 is an apocalyptic number.

It is an amenable number.

18608881 is a deficient number, since it is larger than the sum of its proper divisors (1).

18608881 is an equidigital number, since it uses as much as digits as its factorization.

18608881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 40.

The square root of 18608881 is about 4313.8012239787. The cubic root of 18608881 is about 264.9964684471.

The spelling of 18608881 in words is "eighteen million, six hundred eight thousand, eight hundred eighty-one".