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10861 is a prime number
BaseRepresentation
bin10101001101101
3112220021
42221231
5321421
6122141
743444
oct25155
915807
1010861
118184
126351
134c36
143d5b
153341
hex2a6d

10861 has 2 divisors, whose sum is σ = 10862. Its totient is φ = 10860.

The previous prime is 10859. The next prime is 10867. The reversal of 10861 is 16801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8836 + 2025 = 94^2 + 45^2 .It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 19801 and 10891.

It is a cyclic number.

It is not a de Polignac number, because 10861 - 21 = 10859 is a prime.

It is a super-2 number, since 2×108612 = 235922642, which contains 22 as substring.

Together with 10859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5430 + 5431.

It is an arithmetic number, because the mean of its divisors is an integer number (5431).

210861 is an apocalyptic number.

It is an amenable number.

10861 is a deficient number, since it is larger than the sum of its proper divisors (1).

10861 is an equidigital number, since it uses as much as digits as its factorization.

10861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 10861 is about 104.2161215935. The cubic root of 10861 is about 22.1457267972.

It can be divided in two parts, 108 and 61, that added together give a square (169 = 132).

The spelling of 10861 in words is "ten thousand, eight hundred sixty-one".