851971769 has 8 divisors (see below), whose sum is σ = 937106400. Its totient is φ = 774518580.

The previous prime is 851971763. The next prime is 851971781. The reversal of 851971769 is 967179158.

It is a de Polignac number, because none of the positive numbers 2^k-851971769 is a prime.

It is a super-2 number, since 2×851971769² = 1451711790345978722, 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 851971769.

It is not an unprimeable number, because it can be changed into a prime (851971763) 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, 318719 + ... + 321380.

It is an arithmetic number, because the mean of its divisors is an integer number (117138300).

Almost surely, 2^851971769 is an apocalyptic number.

It is an amenable number.

851971769 is a deficient number, since it is larger than the sum of its proper divisors (85134631).

851971769 is an equidigital number, since it uses as much as digits as its factorization.

851971769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640132 (or 640110 counting only the distinct ones).

The product of its digits is 952560, while the sum is 53.

The square root of 851971769 is about 29188.5554455852. Note that the first 3 decimals coincide. The cubic root of 851971769 is about 948.0001398310. Note that the first 3 decimals are identical.

The spelling of 851971769 in words is "eight hundred fifty-one million, nine hundred seventy-one thousand, seven hundred sixty-nine".