19140128497 has 4 divisors (see below), whose sum is σ = 21874432576. Its totient is φ = 16405824420.

The previous prime is 19140128489. The next prime is 19140128503. The reversal of 19140128497 is 79482104191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19140128497 - 2³ = 19140128489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19140128437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1367152029 + ... + 1367152042.

It is an arithmetic number, because the mean of its divisors is an integer number (5468608144).

Almost surely, 2^19140128497 is an apocalyptic number.

It is an amenable number.

19140128497 is a deficient number, since it is larger than the sum of its proper divisors (2734304079).

19140128497 is an equidigital number, since it uses as much as digits as its factorization.

19140128497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2734304078.

The product of its (nonzero) digits is 145152, while the sum is 46.

It can be divided in two parts, 19140128 and 497, that added together give a square (19140625 = 4375²).

The spelling of 19140128497 in words is "nineteen billion, one hundred forty million, one hundred twenty-eight thousand, four hundred ninety-seven".