19408729231 has 2 divisors, whose sum is σ = 19408729232. Its totient is φ = 19408729230.

The previous prime is 19408729177. The next prime is 19408729247. The reversal of 19408729231 is 13292780491.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19408729231 - 2⁷ = 19408729103 is a prime.

It is a super-3 number, since 3×19408729231³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19408769231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9704364615 + 9704364616.

It is an arithmetic number, because the mean of its divisors is an integer number (9704364616).

Almost surely, 2^19408729231 is an apocalyptic number.

19408729231 is a deficient number, since it is larger than the sum of its proper divisors (1).

19408729231 is an equidigital number, since it uses as much as digits as its factorization.

19408729231 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 19408729231 in words is "nineteen billion, four hundred eight million, seven hundred twenty-nine thousand, two hundred thirty-one".