215411315209 has 2 divisors, whose sum is σ = 215411315210. Its totient is φ = 215411315208.

The previous prime is 215411315183. The next prime is 215411315213. The reversal of 215411315209 is 902513114512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112516639225 + 102894675984 = 335435^2 + 320772^2 .

It is a cyclic number.

It is not a de Polignac number, because 215411315209 - 2¹⁵ = 215411282441 is a prime.

It is not a weakly prime, because it can be changed into another prime (215411315239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107705657604 + 107705657605.

It is an arithmetic number, because the mean of its divisors is an integer number (107705657605).

Almost surely, 2^215411315209 is an apocalyptic number.

It is an amenable number.

215411315209 is a deficient number, since it is larger than the sum of its proper divisors (1).

215411315209 is an equidigital number, since it uses as much as digits as its factorization.

215411315209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 215411315209 in words is "two hundred fifteen billion, four hundred eleven million, three hundred fifteen thousand, two hundred nine".