215535161 has 2 divisors, whose sum is σ = 215535162. Its totient is φ = 215535160.

The previous prime is 215535119. The next prime is 215535167. The reversal of 215535161 is 161535512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215502400 + 32761 = 14680^2 + 181^2 .

It is a cyclic number.

It is not a de Polignac number, because 215535161 - 2¹⁸ = 215273017 is a prime.

It is not a weakly prime, because it can be changed into another prime (215535167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107767580 + 107767581.

It is an arithmetic number, because the mean of its divisors is an integer number (107767581).

Almost surely, 2^215535161 is an apocalyptic number.

It is an amenable number.

215535161 is a deficient number, since it is larger than the sum of its proper divisors (1).

215535161 is an equidigital number, since it uses as much as digits as its factorization.

215535161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4500, while the sum is 29.

The square root of 215535161 is about 14681.1157954700. The cubic root of 215535161 is about 599.5692843993.

The spelling of 215535161 in words is "two hundred fifteen million, five hundred thirty-five thousand, one hundred sixty-one".