18003701 has 2 divisors, whose sum is σ = 18003702. Its totient is φ = 18003700.

The previous prime is 18003691. The next prime is 18003703. The reversal of 18003701 is 10730081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17631601 + 372100 = 4199^2 + 610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18003701 is a prime.

It is a Sophie Germain prime.

Together with 18003703, it forms a pair of twin primes.

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 (18003703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9001850 + 9001851.

It is an arithmetic number, because the mean of its divisors is an integer number (9001851).

Almost surely, 2^18003701 is an apocalyptic number.

It is an amenable number.

18003701 is a deficient number, since it is larger than the sum of its proper divisors (1).

18003701 is an equidigital number, since it uses as much as digits as its factorization.

18003701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 18003701 is about 4243.0768317343. The cubic root of 18003701 is about 262.0920999750.

Adding to 18003701 its reverse (10730081), we get a palindrome (28733782).

The spelling of 18003701 in words is "eighteen million, three thousand, seven hundred one".