851121751 has 8 divisors (see below), whose sum is σ = 854547408. Its totient is φ = 847704000.

The previous prime is 851121727. The next prime is 851121797. The reversal of 851121751 is 157121158.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851121751 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 (851121721) 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 7 ways as a sum of consecutive naturals, for example, 296061 + ... + 298921.

It is an arithmetic number, because the mean of its divisors is an integer number (106818426).

Almost surely, 2^851121751 is an apocalyptic number.

851121751 is a deficient number, since it is larger than the sum of its proper divisors (3425657).

851121751 is a wasteful number, since it uses less digits than its factorization.

851121751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3953.

The product of its digits is 2800, while the sum is 31.

The square root of 851121751 is about 29173.9910022609. The cubic root of 851121751 is about 947.6847595369.

The spelling of 851121751 in words is "eight hundred fifty-one million, one hundred twenty-one thousand, seven hundred fifty-one".