851465 has 4 divisors (see below), whose sum is σ = 1021764. Its totient is φ = 681168.

The previous prime is 851449. The next prime is 851471. The reversal of 851465 is 564158.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 139129 + 712336 = 373^2 + 844^2 .

It is a cyclic number.

It is not a de Polignac number, because 851465 - 2⁴ = 851449 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 851465.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85142 + ... + 85151.

It is an arithmetic number, because the mean of its divisors is an integer number (255441).

2⁸⁵¹⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

851465 is a deficient number, since it is larger than the sum of its proper divisors (170299).

851465 is a wasteful number, since it uses less digits than its factorization.

851465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170298.

The product of its digits is 4800, while the sum is 29.

The square root of 851465 is about 922.7486114864. The cubic root of 851465 is about 94.7812139717.

The spelling of 851465 in words is "eight hundred fifty-one thousand, four hundred sixty-five".