18750913 has 2 divisors, whose sum is σ = 18750914. Its totient is φ = 18750912.

The previous prime is 18750889. The next prime is 18750917. The reversal of 18750913 is 31905781.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 2169729 = 4072^2 + 1473^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18750913 is a prime.

It is not a weakly prime, because it can be changed into another prime (18750917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9375456 + 9375457.

It is an arithmetic number, because the mean of its divisors is an integer number (9375457).

Almost surely, 2^18750913 is an apocalyptic number.

It is an amenable number.

18750913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18750913 is an equidigital number, since it uses as much as digits as its factorization.

18750913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 18750913 is about 4330.2324417980. The cubic root of 18750913 is about 265.6689542580.

The spelling of 18750913 in words is "eighteen million, seven hundred fifty thousand, nine hundred thirteen".