215512501353209 has 2 divisors, whose sum is σ = 215512501353210. Its totient is φ = 215512501353208.

The previous prime is 215512501353001. The next prime is 215512501353263. The reversal of 215512501353209 is 902353105215512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177996876353209 + 37515625000000 = 13341547^2 + 6125000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215512501353209 is a prime.

It is a super-2 number, since 2×215512501353209² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215512501353209.

It is not a weakly prime, because it can be changed into another prime (215512501353509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107756250676604 + 107756250676605.

It is an arithmetic number, because the mean of its divisors is an integer number (107756250676605).

Almost surely, 2^{215512501353209} is an apocalyptic number.

It is an amenable number.

215512501353209 is a deficient number, since it is larger than the sum of its proper divisors (1).

215512501353209 is an equidigital number, since it uses as much as digits as its factorization.

215512501353209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 405000, while the sum is 44.

The spelling of 215512501353209 in words is "two hundred fifteen trillion, five hundred twelve billion, five hundred one million, three hundred fifty-three thousand, two hundred nine".