19500128431 has 64 divisors (see below), whose sum is σ = 24939397120. Its totient is φ = 14872999680.

The previous prime is 19500128419. The next prime is 19500128441. The reversal of 19500128431 is 13482100591.

It is not a de Polignac number, because 19500128431 - 2¹³ = 19500120239 is a prime.

It is a super-2 number, since 2×19500128431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19500128441) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20165110 + ... + 20166076.

It is an arithmetic number, because the mean of its divisors is an integer number (389678080).

Almost surely, 2^19500128431 is an apocalyptic number.

19500128431 is a deficient number, since it is larger than the sum of its proper divisors (5439268689).

19500128431 is a wasteful number, since it uses less digits than its factorization.

19500128431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164.

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 19500128431 in words is "nineteen billion, five hundred million, one hundred twenty-eight thousand, four hundred thirty-one".