811050891901 has 4 divisors (see below), whose sum is σ = 826353738972. Its totient is φ = 795748044832.

The previous prime is 811050891883. The next prime is 811050891913. The reversal of 811050891901 is 109198050118.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 272874595876 + 538176296025 = 522374^2 + 733605^2 .

It is a cyclic number.

It is not a de Polignac number, because 811050891901 - 2⁵ = 811050891869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811050891961) 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, 7651423456 + ... + 7651423561.

It is an arithmetic number, because the mean of its divisors is an integer number (206588434743).

Almost surely, 2^811050891901 is an apocalyptic number.

It is an amenable number.

811050891901 is a deficient number, since it is larger than the sum of its proper divisors (15302847071).

811050891901 is a wasteful number, since it uses less digits than its factorization.

811050891901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15302847070.

The product of its (nonzero) digits is 25920, while the sum is 43.

The spelling of 811050891901 in words is "eight hundred eleven billion, fifty million, eight hundred ninety-one thousand, nine hundred one".