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213501 = 371167
BaseRepresentation
bin110100000111111101
3101211212110
4310013331
523313001
64324233
71546311
oct640775
9354773
10213501
11136452
12a3679
1376242
1457b41
15433d6
hex341fd

213501 has 4 divisors (see below), whose sum is σ = 284672. Its totient is φ = 142332.

The previous prime is 213491. The next prime is 213523. The reversal of 213501 is 105312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 213501 - 214 = 197117 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213901) 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, 35581 + ... + 35586.

It is an arithmetic number, because the mean of its divisors is an integer number (71168).

2213501 is an apocalyptic number.

It is an amenable number.

213501 is a deficient number, since it is larger than the sum of its proper divisors (71171).

213501 is an equidigital number, since it uses as much as digits as its factorization.

213501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71170.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 213501 is about 462.0616841938. The cubic root of 213501 is about 59.7677129840.

Adding to 213501 its product of nonzero digits (30), we get a triangular number (213531 = T653).

Adding to 213501 its reverse (105312), we get a palindrome (318813).

The spelling of 213501 in words is "two hundred thirteen thousand, five hundred one".

Divisors: 1 3 71167 213501