709033045681 has 3 divisors (see below), whose sum is σ = 709033887723. Its totient is φ = 709032203640.

The previous prime is 709033045673. The next prime is 709033045717. The reversal of 709033045681 is 186540330907.

The square root of 709033045681 is 842041.

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

709033045681 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., 605220205681 + 103812840000 = 777959^2 + 322200^2 .

It is not a de Polignac number, because 709033045681 - 2³ = 709033045673 is a prime.

It is a super-2 number, since 2×709033045681² (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 (709033045481) 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, 421021 + ... + 1263061.

It is an arithmetic number, because the mean of its divisors is an integer number (236344629241).

Almost surely, 2^709033045681 is an apocalyptic number.

709033045681 is the 842041-st square number.

709033045681 is the 421021-st centered octagonal number.

It is an amenable number.

709033045681 is a deficient number, since it is larger than the sum of its proper divisors (842042).

709033045681 is an frugal number, since it uses more digits than its factorization.

709033045681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684082 (or 842041 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 709033045681 in words is "seven hundred nine billion, thirty-three million, forty-five thousand, six hundred eighty-one".