4181044921 has 3 divisors (see below), whose sum is σ = 4181109583. Its totient is φ = 4180980260.

The previous prime is 4181044909. The next prime is 4181044951. The reversal of 4181044921 is 1294401814.

The square root of 4181044921 is 64661.

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 can be written as a sum of positive squares in only one way, i.e., 56836521 + 4124208400 = 7539^2 + 64220^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4181044921 is a prime.

It is a super-2 number, since 2×4181044921² = 34962273262839792482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4181044951) 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, 32331 + ... + 96991.

Almost surely, 2^4181044921 is an apocalyptic number.

4181044921 is the 64661-st square number.

4181044921 is the 32331-st centered octagonal number.

It is an amenable number.

4181044921 is a deficient number, since it is larger than the sum of its proper divisors (64662).

4181044921 is an frugal number, since it uses more digits than its factorization.

4181044921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129322 (or 64661 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The cubic root of 4181044921 is about 1610.9977896089.

Multiplying 4181044921 by its product of nonzero digits (9216), we get a square (38532509991936 = 6207456²).

The spelling of 4181044921 in words is "four billion, one hundred eighty-one million, forty-four thousand, nine hundred twenty-one".