19534230811 has 4 divisors (see below), whose sum is σ = 19534830952. Its totient is φ = 19533630672.

The previous prime is 19534230769. The next prime is 19534230839. The reversal of 19534230811 is 11803243591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11803243591 = 43 ⋅274494037.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19534230811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19534230311) 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, 248265 + ... + 317338.

It is an arithmetic number, because the mean of its divisors is an integer number (4883707738).

Almost surely, 2^19534230811 is an apocalyptic number.

19534230811 is a deficient number, since it is larger than the sum of its proper divisors (600141).

19534230811 is an equidigital number, since it uses as much as digits as its factorization.

19534230811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600140.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 19534230811 in words is "nineteen billion, five hundred thirty-four million, two hundred thirty thousand, eight hundred eleven".