213461 has 2 divisors, whose sum is σ = 213462. Its totient is φ = 213460.
The previous prime is 213449. The next prime is 213467. The reversal of 213461 is 164312.
213461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 184900 + 28561 = 430^2 + 169^2 .
It is a cyclic number.
It is not a de Polignac number, because 213461 - 26 = 213397 is a prime.
It is a Chen prime.
It is a nialpdrome in base 13.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 213461.
It is not a weakly prime, because it can be changed into another prime (213467) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106730 + 106731.
It is an arithmetic number, because the mean of its divisors is an integer number (106731).
2213461 is an apocalyptic number.
It is an amenable number.
213461 is a deficient number, since it is larger than the sum of its proper divisors (1).
213461 is an equidigital number, since it uses as much as digits as its factorization.
213461 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 144, while the sum is 17.
The square root of 213461 is about 462.0183979021. The cubic root of 213461 is about 59.7639802024.
Subtracting from 213461 its sum of digits (17), we obtain a square (213444 = 4622).
Adding to 213461 its reverse (164312), we get a palindrome (377773).
The spelling of 213461 in words is "two hundred thirteen thousand, four hundred sixty-one".
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