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86531 is a prime number
BaseRepresentation
bin10101001000000011
311101200212
4111020003
510232111
61504335
7510164
oct251003
9141625
1086531
115a015
12420ab
1330503
142376b
151a98b
hex15203

86531 has 2 divisors, whose sum is σ = 86532. Its totient is φ = 86530.

The previous prime is 86509. The next prime is 86533. The reversal of 86531 is 13568.

86531 is nontrivially palindromic in base 13.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86531 - 26 = 86467 is a prime.

It is a super-2 number, since 2×865312 = 14975227922, which contains 22 as substring.

Together with 86533, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 86497 and 86506.

It is not a weakly prime, because it can be changed into another prime (86533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43265 + 43266.

It is an arithmetic number, because the mean of its divisors is an integer number (43266).

286531 is an apocalyptic number.

86531 is a deficient number, since it is larger than the sum of its proper divisors (1).

86531 is an equidigital number, since it uses as much as digits as its factorization.

86531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 86531 is about 294.1615202572. The cubic root of 86531 is about 44.2307096698.

The spelling of 86531 in words is "eighty-six thousand, five hundred thirty-one".