800121157 has 4 divisors (see below), whose sum is σ = 872859456. Its totient is φ = 727382860.

The previous prime is 800121151. The next prime is 800121187. The reversal of 800121157 is 751121008.

800121157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 800121157 - 2⁷ = 800121029 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 (800121151) 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, 36369133 + ... + 36369154.

It is an arithmetic number, because the mean of its divisors is an integer number (218214864).

Almost surely, 2^800121157 is an apocalyptic number.

It is an amenable number.

800121157 is a deficient number, since it is larger than the sum of its proper divisors (72738299).

800121157 is a wasteful number, since it uses less digits than its factorization.

800121157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72738298.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 800121157 is about 28286.4129397844. The cubic root of 800121157 is about 928.3646277719.

The spelling of 800121157 in words is "eight hundred million, one hundred twenty-one thousand, one hundred fifty-seven".