2218434492481 has 3 divisors (see below), whose sum is σ = 2218435981923. Its totient is φ = 2218433003040.

The previous prime is 2218434492467. The next prime is 2218434492487. The reversal of 2218434492481 is 1842944348122.

The square root of 2218434492481 is 1489441.

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., 606855022081 + 1611579470400 = 779009^2 + 1269480^2 .

It is not a de Polignac number, because 2218434492481 - 2²¹ = 2218432395329 is a prime.

It is a super-2 number, since 2×2218434492481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2218434492487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 744721 + ... + 2234161.

It is an arithmetic number, because the mean of its divisors is an integer number (739478660641).

Almost surely, 2^{2218434492481} is an apocalyptic number.

2218434492481 is the 1489441-st square number.

2218434492481 is the 744721-st centered octagonal number.

It is an amenable number.

2218434492481 is a deficient number, since it is larger than the sum of its proper divisors (1489442).

2218434492481 is an frugal number, since it uses more digits than its factorization.

2218434492481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2978882 (or 1489441 counting only the distinct ones).

The product of its digits is 3538944, while the sum is 52.

The spelling of 2218434492481 in words is "two trillion, two hundred eighteen billion, four hundred thirty-four million, four hundred ninety-two thousand, four hundred eighty-one".