5070721681 has 3 divisors (see below), whose sum is σ = 5070792891. Its totient is φ = 5070650472.

The previous prime is 5070721673. The next prime is 5070721769. The reversal of 5070721681 is 1861270705.

The square root of 5070721681 is 71209.

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., 41075281 + 5029646400 = 6409^2 + 70920^2 .

It is not a de Polignac number, because 5070721681 - 2³ = 5070721673 is a prime.

It is a super-2 number, since 2×5070721681² = 51424436732326931522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5070721681.

It is not an unprimeable number, because it can be changed into a prime (5070701681) 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, 35605 + ... + 106813.

It is an arithmetic number, because the mean of its divisors is an integer number (1690264297).

Almost surely, 2^5070721681 is an apocalyptic number.

5070721681 is the 71209-th square number.

5070721681 is the 35605-th centered octagonal number.

It is an amenable number.

5070721681 is a deficient number, since it is larger than the sum of its proper divisors (71210).

5070721681 is an frugal number, since it uses more digits than its factorization.

5070721681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142418 (or 71209 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 37.

The cubic root of 5070721681 is about 1718.0003895162. Note that the first 3 decimals are identical.

The spelling of 5070721681 in words is "five billion, seventy million, seven hundred twenty-one thousand, six hundred eighty-one".