851121790 has 16 divisors (see below), whose sum is σ = 1567648368. Its totient is φ = 332531136.

The previous prime is 851121727. The next prime is 851121797. The reversal of 851121790 is 97121158.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851121797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 989247 + ... + 990106.

It is an arithmetic number, because the mean of its divisors is an integer number (97978023).

Almost surely, 2^851121790 is an apocalyptic number.

851121790 is a deficient number, since it is larger than the sum of its proper divisors (716526578).

851121790 is a wasteful number, since it uses less digits than its factorization.

851121790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979403.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 851121790 is about 29173.9916706645. The cubic root of 851121790 is about 947.6847740118.

The spelling of 851121790 in words is "eight hundred fifty-one million, one hundred twenty-one thousand, seven hundred ninety".