801815121 has 24 divisors (see below), whose sum is σ = 1210337856. Its totient is φ = 510539040.

The previous prime is 801815099. The next prime is 801815173. The reversal of 801815121 is 121518108.

It is not a de Polignac number, because 801815121 - 2⁵ = 801815089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (801815191) 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 23 ways as a sum of consecutive naturals, for example, 157506 + ... + 162516.

It is an arithmetic number, because the mean of its divisors is an integer number (50430744).

Almost surely, 2^801815121 is an apocalyptic number.

It is an amenable number.

801815121 is a deficient number, since it is larger than the sum of its proper divisors (408522735).

801815121 is a wasteful number, since it uses less digits than its factorization.

801815121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5813 (or 5810 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 27.

The square root of 801815121 is about 28316.3401766542. The cubic root of 801815121 is about 929.0193235159.

The spelling of 801815121 in words is "eight hundred one million, eight hundred fifteen thousand, one hundred twenty-one".