2181733481 has 4 divisors (see below), whose sum is σ = 2256965700. Its totient is φ = 2106501264.

The previous prime is 2181733429. The next prime is 2181733483. The reversal of 2181733481 is 1843371812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1424383081 + 757350400 = 37741^2 + 27520^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181733481 - 2⁶ = 2181733417 is a prime.

It is a super-2 number, since 2×2181733481² = 9519921964232754722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2181733483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37616066 + ... + 37616123.

It is an arithmetic number, because the mean of its divisors is an integer number (564241425).

Almost surely, 2^2181733481 is an apocalyptic number.

It is an amenable number.

2181733481 is a deficient number, since it is larger than the sum of its proper divisors (75232219).

2181733481 is an equidigital number, since it uses as much as digits as its factorization.

2181733481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75232218.

The product of its digits is 32256, while the sum is 38.

The square root of 2181733481 is about 46709.0299728008. The cubic root of 2181733481 is about 1296.9818505941.

The spelling of 2181733481 in words is "two billion, one hundred eighty-one million, seven hundred thirty-three thousand, four hundred eighty-one".