18641801 has 2 divisors, whose sum is σ = 18641802. Its totient is φ = 18641800.

The previous prime is 18641789. The next prime is 18641813. The reversal of 18641801 is 10814681.

It is a balanced prime because it is at equal distance from previous prime (18641789) and next prime (18641813).

It can be written as a sum of positive squares in only one way, i.e., 16192576 + 2449225 = 4024^2 + 1565^2 .

It is an emirp because it is prime and its reverse (10814681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18641801 - 2¹⁰ = 18640777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18641501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9320900 + 9320901.

It is an arithmetic number, because the mean of its divisors is an integer number (9320901).

Almost surely, 2^18641801 is an apocalyptic number.

It is an amenable number.

18641801 is a deficient number, since it is larger than the sum of its proper divisors (1).

18641801 is an equidigital number, since it uses as much as digits as its factorization.

18641801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 18641801 is about 4317.6151982315. The cubic root of 18641801 is about 265.1526401980.

The spelling of 18641801 in words is "eighteen million, six hundred forty-one thousand, eight hundred one".