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215261 is a prime number
BaseRepresentation
bin110100100011011101
3101221021122
4310203131
523342021
64340325
71554404
oct644335
9357248
10215261
11137802
12a46a5
1376c97
145863b
1543bab
hex348dd

215261 has 2 divisors, whose sum is σ = 215262. Its totient is φ = 215260.

The previous prime is 215249. The next prime is 215273. The reversal of 215261 is 162512.

It is a balanced prime because it is at equal distance from previous prime (215249) and next prime (215273).

It can be written as a sum of positive squares in only one way, i.e., 155236 + 60025 = 394^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 215261 - 26 = 215197 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107630 + 107631.

It is an arithmetic number, because the mean of its divisors is an integer number (107631).

2215261 is an apocalyptic number.

It is an amenable number.

215261 is a deficient number, since it is larger than the sum of its proper divisors (1).

215261 is an equidigital number, since it uses as much as digits as its factorization.

215261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 17.

The square root of 215261 is about 463.9622829498. The cubic root of 215261 is about 59.9314958903.

Adding to 215261 its reverse (162512), we get a palindrome (377773).

The spelling of 215261 in words is "two hundred fifteen thousand, two hundred sixty-one".