811890892801 has 4 divisors (see below), whose sum is σ = 811898278704. Its totient is φ = 811883506900.

The previous prime is 811890892739. The next prime is 811890892903. The reversal of 811890892801 is 108298098118.

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 a de Polignac number, because none of the positive numbers 2^k-811890892801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811890892601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3525535 + ... + 3748756.

It is an arithmetic number, because the mean of its divisors is an integer number (202974569676).

Almost surely, 2^811890892801 is an apocalyptic number.

It is an amenable number.

811890892801 is a deficient number, since it is larger than the sum of its proper divisors (7385903).

811890892801 is a wasteful number, since it uses less digits than its factorization.

811890892801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7385902.

The product of its (nonzero) digits is 663552, while the sum is 55.

The spelling of 811890892801 in words is "eight hundred eleven billion, eight hundred ninety million, eight hundred ninety-two thousand, eight hundred one".