215161 has 2 divisors, whose sum is σ = 215162. Its totient is φ = 215160.

The previous prime is 215153. The next prime is 215179. The reversal of 215161 is 161512.

It is a happy number.

215161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207936 + 7225 = 456^2 + 85^2 .

It is a cyclic number.

It is not a de Polignac number, because 215161 - 2³ = 215153 is a prime.

215161 is a lucky number.

It is equal to p₁₉₂₂₂ and since 215161 and 19222 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (215141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107580 + 107581.

It is an arithmetic number, because the mean of its divisors is an integer number (107581).

2²¹⁵¹⁶¹ is an apocalyptic number.

It is an amenable number.

215161 is a deficient number, since it is larger than the sum of its proper divisors (1).

215161 is an equidigital number, since it uses as much as digits as its factorization.

215161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60, while the sum is 16.

The square root of 215161 is about 463.8545030503. The cubic root of 215161 is about 59.9222140141.

Adding to 215161 its reverse (161512), we get a palindrome (376673).

The spelling of 215161 in words is "two hundred fifteen thousand, one hundred sixty-one".