811321738756 has 9 divisors (see below), whose sum is σ = 1419816195399. Its totient is φ = 405659968644.

The previous prime is 811321738741. The next prime is 811321738769. The reversal of 811321738756 is 657837123118.

The square root of 811321738756 is 900734.

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

It is a super-4 number, since 4×811321738756⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1576285 + ... + 2026651.

Almost surely, 2^811321738756 is an apocalyptic number.

811321738756 is the 900734-th square number.

It is an amenable number.

811321738756 is a deficient number, since it is larger than the sum of its proper divisors (608494456643).

811321738756 is an frugal number, since it uses more digits than its factorization.

811321738756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900738 (or 450369 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 52.

The spelling of 811321738756 in words is "eight hundred eleven billion, three hundred twenty-one million, seven hundred thirty-eight thousand, seven hundred fifty-six".