860551 has 4 divisors (see below), whose sum is σ = 865872. Its totient is φ = 855232.

The previous prime is 860543. The next prime is 860569. The reversal of 860551 is 155068.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 860551 - 2³ = 860543 is a prime.

It is a Duffinian number.

860551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (860501) 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, 2410 + ... + 2743.

It is an arithmetic number, because the mean of its divisors is an integer number (216468).

2⁸⁶⁰⁵⁵¹ is an apocalyptic number.

860551 is a deficient number, since it is larger than the sum of its proper divisors (5321).

860551 is a wasteful number, since it uses less digits than its factorization.

860551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5320.

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

The square root of 860551 is about 927.6588812705. The cubic root of 860551 is about 95.1171592391.

The spelling of 860551 in words is "eight hundred sixty thousand, five hundred fifty-one".