18319507 has 2 divisors, whose sum is σ = 18319508. Its totient is φ = 18319506.

The previous prime is 18319463. The next prime is 18319513. The reversal of 18319507 is 70591381.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18319507 is a prime.

It is not a weakly prime, because it can be changed into another prime (18319537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9159753 + 9159754.

It is an arithmetic number, because the mean of its divisors is an integer number (9159754).

Almost surely, 2^18319507 is an apocalyptic number.

18319507 is a deficient number, since it is larger than the sum of its proper divisors (1).

18319507 is an equidigital number, since it uses as much as digits as its factorization.

18319507 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18319507 is about 4280.1293204762. The cubic root of 18319507 is about 263.6156933205.

The spelling of 18319507 in words is "eighteen million, three hundred nineteen thousand, five hundred seven".