19406539099 has 2 divisors, whose sum is σ = 19406539100. Its totient is φ = 19406539098.

The previous prime is 19406539093. The next prime is 19406539123. The reversal of 19406539099 is 99093560491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19406539099 - 2⁹ = 19406538587 is a prime.

It is a super-2 number, since 2×19406539099² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19406539093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9703269549 + 9703269550.

It is an arithmetic number, because the mean of its divisors is an integer number (9703269550).

Almost surely, 2^19406539099 is an apocalyptic number.

19406539099 is a deficient number, since it is larger than the sum of its proper divisors (1).

19406539099 is an equidigital number, since it uses as much as digits as its factorization.

19406539099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2361960, while the sum is 55.

The spelling of 19406539099 in words is "nineteen billion, four hundred six million, five hundred thirty-nine thousand, ninety-nine".