19074188513 has 4 divisors (see below), whose sum is σ = 20196199620. Its totient is φ = 17952177408.

The previous prime is 19074188509. The next prime is 19074188519. The reversal of 19074188513 is 31588147091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31588147091 = 227 ⋅139154833.

It can be written as a sum of positive squares in 2 ways, for example, as 17801696929 + 1272491584 = 133423^2 + 35672^2 .

It is a cyclic number.

It is not a de Polignac number, because 19074188513 - 2² = 19074188509 is a prime.

It is a super-2 number, since 2×19074188513² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19074188519) 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, 561005528 + ... + 561005561.

It is an arithmetic number, because the mean of its divisors is an integer number (5049049905).

Almost surely, 2^19074188513 is an apocalyptic number.

It is an amenable number.

19074188513 is a deficient number, since it is larger than the sum of its proper divisors (1122011107).

19074188513 is a wasteful number, since it uses less digits than its factorization.

19074188513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122011106.

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 19074188513 in words is "nineteen billion, seventy-four million, one hundred eighty-eight thousand, five hundred thirteen".