215461 has 2 divisors, whose sum is σ = 215462. Its totient is φ = 215460.

The previous prime is 215459. The next prime is 215471. The reversal of 215461 is 164512.

215461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is the 190-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164836 + 50625 = 406^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 215461 - 2¹ = 215459 is a prime.

Together with 215459, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107730 + 107731.

It is an arithmetic number, because the mean of its divisors is an integer number (107731).

2²¹⁵⁴⁶¹ is an apocalyptic number.

It is an amenable number.

215461 is a deficient number, since it is larger than the sum of its proper divisors (1).

215461 is an equidigital number, since it uses as much as digits as its factorization.

215461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 19.

The square root of 215461 is about 464.1777676710. The cubic root of 215461 is about 59.9500510225.

Adding to 215461 its reverse (164512), we get a palindrome (379973).

It can be divided in two parts, 215 and 461, that added together give a palindrome (676).

The spelling of 215461 in words is "two hundred fifteen thousand, four hundred sixty-one".