18913801 has 3 divisors (see below), whose sum is σ = 18918151. Its totient is φ = 18909452.

The previous prime is 18913799. The next prime is 18913819. The reversal of 18913801 is 10831981.

The square root of 18913801 is 4349.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10831981 = 53 ⋅204377.

It can be written as a sum of positive squares in only one way, i.e., 423801 + 18490000 = 651^2 + 4300^2 .

It is not a de Polignac number, because 18913801 - 2¹ = 18913799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18913841) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2175 + ... + 6523.

Almost surely, 2^18913801 is an apocalyptic number.

18913801 is the 4349-th square number.

18913801 is the 2175-th centered octagonal number.

It is an amenable number.

18913801 is a deficient number, since it is larger than the sum of its proper divisors (4350).

18913801 is an frugal number, since it uses more digits than its factorization.

18913801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8698 (or 4349 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 31.

The cubic root of 18913801 is about 266.4360205316.

The spelling of 18913801 in words is "eighteen million, nine hundred thirteen thousand, eight hundred one".