18888913 has 2 divisors, whose sum is σ = 18888914. Its totient is φ = 18888912.

The previous prime is 18888871. The next prime is 18888941. The reversal of 18888913 is 31988881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15000129 + 3888784 = 3873^2 + 1972^2 .

It is an emirp because it is prime and its reverse (31988881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18888913 is a prime.

It is not a weakly prime, because it can be changed into another prime (18888973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9444456 + 9444457.

It is an arithmetic number, because the mean of its divisors is an integer number (9444457).

Almost surely, 2^18888913 is an apocalyptic number.

It is an amenable number.

18888913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18888913 is an equidigital number, since it uses as much as digits as its factorization.

18888913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 46.

The square root of 18888913 is about 4346.1377106576. The cubic root of 18888913 is about 266.3191046645.

It can be divided in two parts, 1888 and 8913, that added together give a palindrome (10801).

The spelling of 18888913 in words is "eighteen million, eight hundred eighty-eight thousand, nine hundred thirteen".