2188415971409 has 2 divisors, whose sum is σ = 2188415971410. Its totient is φ = 2188415971408.

The previous prime is 2188415971393. The next prime is 2188415971429. The reversal of 2188415971409 is 9041795148812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1911297955009 + 277118016400 = 1382497^2 + 526420^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188415971409 - 2⁴ = 2188415971393 is a prime.

It is not a weakly prime, because it can be changed into another prime (2188415971429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094207985704 + 1094207985705.

It is an arithmetic number, because the mean of its divisors is an integer number (1094207985705).

Almost surely, 2^{2188415971409} is an apocalyptic number.

It is an amenable number.

2188415971409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188415971409 is an equidigital number, since it uses as much as digits as its factorization.

2188415971409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 59.

The spelling of 2188415971409 in words is "two trillion, one hundred eighty-eight billion, four hundred fifteen million, nine hundred seventy-one thousand, four hundred nine".