19609240919 has 4 divisors (see below), whose sum is σ = 19663863120. Its totient is φ = 19554618720.

The previous prime is 19609240913. The next prime is 19609240921. The reversal of 19609240919 is 91904290691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19609240919 is a prime.

It is a super-2 number, since 2×19609240919² (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 (19609240913) 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, 27310562 + ... + 27311279.

It is an arithmetic number, because the mean of its divisors is an integer number (4915965780).

Almost surely, 2^19609240919 is an apocalyptic number.

19609240919 is a deficient number, since it is larger than the sum of its proper divisors (54622201).

19609240919 is an equidigital number, since it uses as much as digits as its factorization.

19609240919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54622200.

The product of its (nonzero) digits is 314928, while the sum is 50.

The spelling of 19609240919 in words is "nineteen billion, six hundred nine million, two hundred forty thousand, nine hundred nineteen".