19189461913 has 4 divisors (see below), whose sum is σ = 20023786368. Its totient is φ = 18355137460.

The previous prime is 19189461847. The next prime is 19189461947. The reversal of 19189461913 is 31916498191.

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 19189461913 - 2¹³ = 19189453721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19189461983) 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, 417162193 + ... + 417162238.

It is an arithmetic number, because the mean of its divisors is an integer number (5005946592).

Almost surely, 2^19189461913 is an apocalyptic number.

It is an amenable number.

19189461913 is a deficient number, since it is larger than the sum of its proper divisors (834324455).

19189461913 is an equidigital number, since it uses as much as digits as its factorization.

19189461913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834324454.

The product of its digits is 419904, while the sum is 52.

The spelling of 19189461913 in words is "nineteen billion, one hundred eighty-nine million, four hundred sixty-one thousand, nine hundred thirteen".