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86831 = 312801
BaseRepresentation
bin10101001100101111
311102002222
4111030233
510234311
61505555
7511103
oct251457
9142088
1086831
115a268
12422bb
13306a4
1423903
151aadb
hex1532f

86831 has 4 divisors (see below), whose sum is σ = 89664. Its totient is φ = 84000.

The previous prime is 86813. The next prime is 86837. The reversal of 86831 is 13868.

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 86831 - 26 = 86767 is a prime.

It is a super-2 number, since 2×868312 = 15079245122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86837) 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, 1370 + ... + 1431.

It is an arithmetic number, because the mean of its divisors is an integer number (22416).

286831 is an apocalyptic number.

86831 is a deficient number, since it is larger than the sum of its proper divisors (2833).

86831 is a wasteful number, since it uses less digits than its factorization.

86831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2832.

The product of its digits is 1152, while the sum is 26.

The square root of 86831 is about 294.6710029847. The cubic root of 86831 is about 44.2817661611.

The spelling of 86831 in words is "eighty-six thousand, eight hundred thirty-one".

Divisors: 1 31 2801 86831