865051 has 8 divisors (see below), whose sum is σ = 993600. Its totient is φ = 744840.

The previous prime is 865049. The next prime is 865057. The reversal of 865051 is 150568.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 865051 - 2¹ = 865049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865057) 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 7 ways as a sum of consecutive naturals, for example, 1861 + ... + 2278.

It is an arithmetic number, because the mean of its divisors is an integer number (124200).

2⁸⁶⁵⁰⁵¹ is an apocalyptic number.

865051 is a deficient number, since it is larger than the sum of its proper divisors (128549).

865051 is a wasteful number, since it uses less digits than its factorization.

865051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4169.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 865051 is about 930.0811792526. The cubic root of 865051 is about 95.2826668792.

The spelling of 865051 in words is "eight hundred sixty-five thousand, fifty-one".