215564201 has 2 divisors, whose sum is σ = 215564202. Its totient is φ = 215564200.

The previous prime is 215564161. The next prime is 215564227. The reversal of 215564201 is 102465512.

It is an a-pointer prime, because the next prime (215564227) can be obtained adding 215564201 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213744400 + 1819801 = 14620^2 + 1349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215564201 is a prime.

It is not a weakly prime, because it can be changed into another prime (215561201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107782100 + 107782101.

It is an arithmetic number, because the mean of its divisors is an integer number (107782101).

Almost surely, 2^215564201 is an apocalyptic number.

It is an amenable number.

215564201 is a deficient number, since it is larger than the sum of its proper divisors (1).

215564201 is an equidigital number, since it uses as much as digits as its factorization.

215564201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 215564201 is about 14682.1047878021. The cubic root of 215564201 is about 599.5962107254.

The spelling of 215564201 in words is "two hundred fifteen million, five hundred sixty-four thousand, two hundred one".