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213871 = 730553
BaseRepresentation
bin110100001101101111
3101212101011
4310031233
523320441
64330051
71550350
oct641557
9355334
10213871
11136759
12a3927
1376468
1457d27
1543581
hex3436f

213871 has 4 divisors (see below), whose sum is σ = 244432. Its totient is φ = 183312.

The previous prime is 213859. The next prime is 213881. The reversal of 213871 is 178312.

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 213871 - 29 = 213359 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 (213821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15270 + ... + 15283.

It is an arithmetic number, because the mean of its divisors is an integer number (61108).

2213871 is an apocalyptic number.

213871 is a deficient number, since it is larger than the sum of its proper divisors (30561).

213871 is an equidigital number, since it uses as much as digits as its factorization.

213871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30560.

The product of its digits is 336, while the sum is 22.

The square root of 213871 is about 462.4618903218. The cubic root of 213871 is about 59.8022191322.

It can be divided in two parts, 2138 and 71, that added together give a square (2209 = 472).

The spelling of 213871 in words is "two hundred thirteen thousand, eight hundred seventy-one".

Divisors: 1 7 30553 213871