4181820889 has 3 divisors (see below), whose sum is σ = 4181885557. Its totient is φ = 4181756222.

The previous prime is 4181820887. The next prime is 4181820899. The reversal of 4181820889 is 9880281814.

The square root of 4181820889 is 64667.

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

4181820889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 4181820889 - 2¹ = 4181820887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4181820887) 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, 32334 + ... + 97000.

Almost surely, 2^4181820889 is an apocalyptic number.

4181820889 is the 64667-th square number.

4181820889 is the 32334-th centered octagonal number.

It is an amenable number.

4181820889 is a deficient number, since it is larger than the sum of its proper divisors (64668).

4181820889 is an frugal number, since it uses more digits than its factorization.

4181820889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129334 (or 64667 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 49.

The cubic root of 4181820889 is about 1611.0974461484.

Multiplying 4181820889 by its sum of digits (49), we get a square (204909223561 = 452669²).

The spelling of 4181820889 in words is "four billion, one hundred eighty-one million, eight hundred twenty thousand, eight hundred eighty-nine".