851669369 has 12 divisors (see below), whose sum is σ = 891712500. Its totient is φ = 813356544.

The previous prime is 851669363. The next prime is 851669381. The reversal of 851669369 is 963966158.

It can be written as a sum of positive squares in 2 ways, for example, as 529000000 + 322669369 = 23000^2 + 17963^2 .

It is not a de Polignac number, because 851669369 - 2¹⁶ = 851603833 is a prime.

It is a super-2 number, since 2×851669369² = 1450681428185716322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 851669369.

It is not an unprimeable number, because it can be changed into a prime (851669363) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 660077 + ... + 661365.

It is an arithmetic number, because the mean of its divisors is an integer number (74309375).

Almost surely, 2^851669369 is an apocalyptic number.

It is an amenable number.

851669369 is a deficient number, since it is larger than the sum of its proper divisors (40043131).

851669369 is a wasteful number, since it uses less digits than its factorization.

851669369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2584 (or 2561 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 53.

The square root of 851669369 is about 29183.3748733761. The cubic root of 851669369 is about 947.8879650786.

The spelling of 851669369 in words is "eight hundred fifty-one million, six hundred sixty-nine thousand, three hundred sixty-nine".