811552321 has 4 divisors (see below), whose sum is σ = 813694000. Its totient is φ = 809410644.

The previous prime is 811552303. The next prime is 811552331. The reversal of 811552321 is 123255118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 811552321 - 2⁹ = 811551809 is a prime.

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 811552321.

It is not an unprimeable number, because it can be changed into a prime (811552331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1070271 + ... + 1071028.

It is an arithmetic number, because the mean of its divisors is an integer number (203423500).

Almost surely, 2^811552321 is an apocalyptic number.

It is an amenable number.

811552321 is a deficient number, since it is larger than the sum of its proper divisors (2141679).

811552321 is a wasteful number, since it uses less digits than its factorization.

811552321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141678.

The product of its digits is 2400, while the sum is 28.

The square root of 811552321 is about 28487.7573880430. The cubic root of 811552321 is about 932.7648560172.

The spelling of 811552321 in words is "eight hundred eleven million, five hundred fifty-two thousand, three hundred twenty-one".