19103990509 has 4 divisors (see below), whose sum is σ = 19934598816. Its totient is φ = 18273382204.

The previous prime is 19103990489. The next prime is 19103990527. The reversal of 19103990509 is 90509930191.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90509930191 = 44203 ⋅2047597.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19103990509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19103990539) 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, 415304119 + ... + 415304164.

It is an arithmetic number, because the mean of its divisors is an integer number (4983649704).

Almost surely, 2^19103990509 is an apocalyptic number.

It is an amenable number.

19103990509 is a deficient number, since it is larger than the sum of its proper divisors (830608307).

19103990509 is an equidigital number, since it uses as much as digits as its factorization.

19103990509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830608306.

The product of its (nonzero) digits is 98415, while the sum is 46.

The spelling of 19103990509 in words is "nineteen billion, one hundred three million, nine hundred ninety thousand, five hundred nine".