811211852929 has 3 divisors (see below), whose sum is σ = 811212753603. Its totient is φ = 811210952256.

The previous prime is 811211852923. The next prime is 811211852963. The reversal of 811211852929 is 929258112118.

It is a happy number.

The square root of 811211852929 is 900673.

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., 533111721025 + 278100131904 = 730145^2 + 527352^2 .

It is not a de Polignac number, because 811211852929 - 2¹⁷ = 811211721857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811211852923) 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, 450337 + ... + 1351009.

It is an arithmetic number, because the mean of its divisors is an integer number (270404251201).

Almost surely, 2^811211852929 is an apocalyptic number.

811211852929 is the 900673-rd square number.

811211852929 is the 450337-th centered octagonal number.

It is an amenable number.

811211852929 is a deficient number, since it is larger than the sum of its proper divisors (900674).

811211852929 is an frugal number, since it uses more digits than its factorization.

811211852929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801346 (or 900673 counting only the distinct ones).

The product of its digits is 207360, while the sum is 49.

Multiplying 811211852929 by its sum of digits (49), we get a square (39749380793521 = 6304711²).

The spelling of 811211852929 in words is "eight hundred eleven billion, two hundred eleven million, eight hundred fifty-two thousand, nine hundred twenty-nine".