851455 has 16 divisors (see below), whose sum is σ = 1132704. Its totient is φ = 609280.

The previous prime is 851449. The next prime is 851471. The reversal of 851455 is 554158.

It is not a de Polignac number, because 851455 - 2⁵ = 851423 is a prime.

It is a Duffinian number.

851455 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6147 + ... + 6283.

It is an arithmetic number, because the mean of its divisors is an integer number (70794).

2⁸⁵¹⁴⁵⁵ is an apocalyptic number.

851455 is a deficient number, since it is larger than the sum of its proper divisors (281249).

851455 is a wasteful number, since it uses less digits than its factorization.

851455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266.

The product of its digits is 4000, while the sum is 28.

The square root of 851455 is about 922.7431928765. The cubic root of 851455 is about 94.7808429188.

It can be divided in two parts, 85 and 1455, that added together give a triangular number (1540 = T₅₅).

The spelling of 851455 in words is "eight hundred fifty-one thousand, four hundred fifty-five".