18490288441 has 3 divisors (see below), whose sum is σ = 18490424421. Its totient is φ = 18490152462.

The previous prime is 18490288429. The next prime is 18490288447. The reversal of 18490288441 is 14488209481.

The square root of 18490288441 is 135979.

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.

It is not a de Polignac number, because 18490288441 - 2¹⁵ = 18490255673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18490288447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 67990 + ... + 203968.

It is an arithmetic number, because the mean of its divisors is an integer number (6163474807).

Almost surely, 2^18490288441 is an apocalyptic number.

18490288441 is the 135979-th square number.

18490288441 is the 67990-th centered octagonal number.

It is an amenable number.

18490288441 is a deficient number, since it is larger than the sum of its proper divisors (135980).

18490288441 is an frugal number, since it uses more digits than its factorization.

18490288441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271958 (or 135979 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 49.

Multiplying 18490288441 by its sum of digits (49), we get a square (906024133609 = 951853²).

The spelling of 18490288441 in words is "eighteen billion, four hundred ninety million, two hundred eighty-eight thousand, four hundred forty-one".