851013 has 16 divisors (see below), whose sum is σ = 1291840. Its totient is φ = 553392.

The previous prime is 851009. The next prime is 851017. The reversal of 851013 is 310158.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (851009) and next prime (851017).

It is not a de Polignac number, because 851013 - 2² = 851009 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851017) 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 in 15 ways as a sum of consecutive naturals, for example, 795 + ... + 1527.

It is an arithmetic number, because the mean of its divisors is an integer number (80740).

2⁸⁵¹⁰¹³ is an apocalyptic number.

It is an amenable number.

851013 is a deficient number, since it is larger than the sum of its proper divisors (440827).

851013 is a wasteful number, since it uses less digits than its factorization.

851013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 851013 is about 922.5036585293. The cubic root of 851013 is about 94.7644394746.

The spelling of 851013 in words is "eight hundred fifty-one thousand, thirteen".