851212869 has 8 divisors (see below), whose sum is σ = 1222254432. Its totient is φ = 523823280.

The previous prime is 851212867. The next prime is 851212871. The reversal of 851212869 is 968212158.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (851212867) and next prime (851212871).

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

It is not a de Polignac number, because 851212869 - 2¹ = 851212867 is a prime.

It is a super-2 number, since 2×851212869² = 1449126696702422322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 851212869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851212867) 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, 10912947 + ... + 10913024.

It is an arithmetic number, because the mean of its divisors is an integer number (152781804).

Almost surely, 2^851212869 is an apocalyptic number.

It is an amenable number.

851212869 is a deficient number, since it is larger than the sum of its proper divisors (371041563).

851212869 is a wasteful number, since it uses less digits than its factorization.

851212869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21825987.

The product of its digits is 69120, while the sum is 42.

The square root of 851212869 is about 29175.5525911678. The cubic root of 851212869 is about 947.7185768916.

It can be divided in two parts, 85121 and 2869, that added together give a triangular number (87990 = T₄₁₉).

The spelling of 851212869 in words is "eight hundred fifty-one million, two hundred twelve thousand, eight hundred sixty-nine".