18319901 has 2 divisors, whose sum is σ = 18319902. Its totient is φ = 18319900.

The previous prime is 18319837. The next prime is 18319919. The reversal of 18319901 is 10991381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13697401 + 4622500 = 3701^2 + 2150^2 .

It is an emirp because it is prime and its reverse (10991381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18319901 - 2⁶ = 18319837 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18319991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9159950 + 9159951.

It is an arithmetic number, because the mean of its divisors is an integer number (9159951).

Almost surely, 2^18319901 is an apocalyptic number.

It is an amenable number.

18319901 is a deficient number, since it is larger than the sum of its proper divisors (1).

18319901 is an equidigital number, since it uses as much as digits as its factorization.

18319901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 18319901 is about 4280.1753468754. The cubic root of 18319901 is about 263.6175831792.

The spelling of 18319901 in words is "eighteen million, three hundred nineteen thousand, nine hundred one".