811121798 has 4 divisors (see below), whose sum is σ = 1216682700. Its totient is φ = 405560898.

The previous prime is 811121791. The next prime is 811121803. The reversal of 811121798 is 897121118.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811121791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202780448 + ... + 202780451.

It is an arithmetic number, because the mean of its divisors is an integer number (304170675).

Almost surely, 2^811121798 is an apocalyptic number.

811121798 is a deficient number, since it is larger than the sum of its proper divisors (405560902).

811121798 is a wasteful number, since it uses less digits than its factorization.

811121798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405560901.

The product of its digits is 8064, while the sum is 38.

The square root of 811121798 is about 28480.2001046341. The cubic root of 811121798 is about 932.5998850327.

The spelling of 811121798 in words is "eight hundred eleven million, one hundred twenty-one thousand, seven hundred ninety-eight".