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213891 = 383859
BaseRepresentation
bin110100001110000011
3101212101220
4310032003
523321031
64330123
71550406
oct641603
9355356
10213891
11136777
12a3943
1376482
1457d3d
1543596
hex34383

213891 has 8 divisors (see below), whose sum is σ = 288960. Its totient is φ = 140712.

The previous prime is 213887. The next prime is 213901. The reversal of 213891 is 198312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213891 - 22 = 213887 is a prime.

It is a plaindrome in base 11.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 213891.

It is not an unprimeable number, because it can be changed into a prime (213821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181 + ... + 678.

It is an arithmetic number, because the mean of its divisors is an integer number (36120).

2213891 is an apocalyptic number.

213891 is the 293-rd centered pentagonal number.

213891 is a deficient number, since it is larger than the sum of its proper divisors (75069).

213891 is an equidigital number, since it uses as much as digits as its factorization.

213891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945.

The product of its digits is 432, while the sum is 24.

The square root of 213891 is about 462.4835132197. The cubic root of 213891 is about 59.8040831953.

The spelling of 213891 in words is "two hundred thirteen thousand, eight hundred ninety-one".

Divisors: 1 3 83 249 859 2577 71297 213891