870851 has 4 divisors (see below), whose sum is σ = 873672. Its totient is φ = 868032.

The previous prime is 870847. The next prime is 870853. The reversal of 870851 is 158078.

It is a happy number.

870851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158078 = 2 ⋅79039.

It is a cyclic number.

It is not a de Polignac number, because 870851 - 2² = 870847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 881 + ... + 1586.

It is an arithmetic number, because the mean of its divisors is an integer number (218418).

2⁸⁷⁰⁸⁵¹ is an apocalyptic number.

870851 is a deficient number, since it is larger than the sum of its proper divisors (2821).

870851 is a wasteful number, since it uses less digits than its factorization.

870851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 870851 is about 933.1939776917. The cubic root of 870851 is about 95.4951433437.

The spelling of 870851 in words is "eight hundred seventy thousand, eight hundred fifty-one".