19406539129 has 2 divisors, whose sum is σ = 19406539130. Its totient is φ = 19406539128.

The previous prime is 19406539123. The next prime is 19406539153. The reversal of 19406539129 is 92193560491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14828663529 + 4577875600 = 121773^2 + 67660^2 .

It is a cyclic number.

It is not a de Polignac number, because 19406539129 - 2²⁷ = 19272321401 is a prime.

It is a super-2 number, since 2×19406539129² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19406539123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9703269564 + 9703269565.

It is an arithmetic number, because the mean of its divisors is an integer number (9703269565).

Almost surely, 2^19406539129 is an apocalyptic number.

It is an amenable number.

19406539129 is a deficient number, since it is larger than the sum of its proper divisors (1).

19406539129 is an equidigital number, since it uses as much as digits as its factorization.

19406539129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 49.

The spelling of 19406539129 in words is "nineteen billion, four hundred six million, five hundred thirty-nine thousand, one hundred twenty-nine".