11478409309 has 2 divisors, whose sum is σ = 11478409310. Its totient is φ = 11478409308.

The previous prime is 11478409297. The next prime is 11478409321. The reversal of 11478409309 is 90390487411.

It is a balanced prime because it is at equal distance from previous prime (11478409297) and next prime (11478409321).

It can be written as a sum of positive squares in only one way, i.e., 11332241209 + 146168100 = 106453^2 + 12090^2 .

It is a cyclic number.

It is not a de Polignac number, because 11478409309 - 2⁹ = 11478408797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11478409399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5739204654 + 5739204655.

It is an arithmetic number, because the mean of its divisors is an integer number (5739204655).

Almost surely, 2^11478409309 is an apocalyptic number.

It is an amenable number.

11478409309 is a deficient number, since it is larger than the sum of its proper divisors (1).

11478409309 is an equidigital number, since it uses as much as digits as its factorization.

11478409309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 11478409309 in words is "eleven billion, four hundred seventy-eight million, four hundred nine thousand, three hundred nine".