851669 has 16 divisors (see below), whose sum is σ = 1075200. Its totient is φ = 670320.

The previous prime is 851659. The next prime is 851671. The reversal of 851669 is 966158.

It is not a de Polignac number, because 851669 - 2⁸ = 851413 is a prime.

It is a super-2 number, since 2×851669² = 1450680171122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4364 + ... + 4554.

It is an arithmetic number, because the mean of its divisors is an integer number (67200).

2⁸⁵¹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

851669 is a deficient number, since it is larger than the sum of its proper divisors (223531).

851669 is a wasteful number, since it uses less digits than its factorization.

851669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 211 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 851669 is about 922.8591441818. The cubic root of 851669 is about 94.7887828182.

The spelling of 851669 in words is "eight hundred fifty-one thousand, six hundred sixty-nine".