273203790721 has 3 divisors (see below), whose sum is σ = 273204313411. Its totient is φ = 273203268032.

The previous prime is 273203790707. The next prime is 273203790733. The reversal of 273203790721 is 127097302372.

The square root of 273203790721 is 522689.

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

273203790721 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 can be written as a sum of positive squares in only one way, i.e., 31769141121 + 241434649600 = 178239^2 + 491360^2 .

It is not a de Polignac number, because 273203790721 - 2¹¹ = 273203788673 is a prime.

It is a super-2 number, since 2×273203790721² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (273203790751) 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, 261345 + ... + 784033.

Almost surely, 2^273203790721 is an apocalyptic number.

273203790721 is the 522689-th square number.

273203790721 is the 261345-th centered octagonal number.

It is an amenable number.

273203790721 is a deficient number, since it is larger than the sum of its proper divisors (522690).

273203790721 is an frugal number, since it uses more digits than its factorization.

273203790721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045378 (or 522689 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 43.

The spelling of 273203790721 in words is "two hundred seventy-three billion, two hundred three million, seven hundred ninety thousand, seven hundred twenty-one".