851042 has 4 divisors (see below), whose sum is σ = 1276566. Its totient is φ = 425520.

The previous prime is 851041. The next prime is 851051. The reversal of 851042 is 240158.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240158 = 2 ⋅120079.

It can be written as a sum of positive squares in only one way, i.e., 609961 + 241081 = 781^2 + 491^2 .

It is not an unprimeable number, because it can be changed into a prime (851041) by changing a digit.

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 as a sum of consecutive naturals, namely, 212759 + ... + 212762.

2⁸⁵¹⁰⁴² is an apocalyptic number.

851042 is a deficient number, since it is larger than the sum of its proper divisors (425524).

851042 is a wasteful number, since it uses less digits than its factorization.

851042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425523.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 851042 is about 922.5193764903. The cubic root of 851042 is about 94.7655158927.

The spelling of 851042 in words is "eight hundred fifty-one thousand, forty-two".