721883031769 has 9 divisors (see below), whose sum is σ = 739098833013. Its totient is φ = 705059369532.

The previous prime is 721883031731. The next prime is 721883031781. The reversal of 721883031769 is 967130388127.

It is a happy number.

The square root of 721883031769 is 849637.

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

It is not a de Polignac number, because 721883031769 - 2¹³ = 721883023577 is a prime.

It is a super-2 number, since 2×721883031769² (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 (721883031469) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 36524512 + ... + 36544270.

It is an arithmetic number, because the mean of its divisors is an integer number (82122092557).

Almost surely, 2^721883031769 is an apocalyptic number.

721883031769 is the 849637-th square number.

721883031769 is the 424819-th centered octagonal number.

It is an amenable number.

721883031769 is a deficient number, since it is larger than the sum of its proper divisors (17215801244).

721883031769 is an frugal number, since it uses more digits than its factorization.

721883031769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39604 (or 19802 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 721883031769 in words is "seven hundred twenty-one billion, eight hundred eighty-three million, thirty-one thousand, seven hundred sixty-nine".