19919159 has 4 divisors (see below), whose sum is σ = 21451416. Its totient is φ = 18386904.

The previous prime is 19919147. The next prime is 19919161. The reversal of 19919159 is 95191991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95191991 = 113 ⋅842407.

It is a cyclic number.

It is not a de Polignac number, because 19919159 - 2²⁰ = 18870583 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 (19919129) 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, 766109 + ... + 766134.

It is an arithmetic number, because the mean of its divisors is an integer number (5362854).

Almost surely, 2^19919159 is an apocalyptic number.

19919159 is a deficient number, since it is larger than the sum of its proper divisors (1532257).

19919159 is a wasteful number, since it uses less digits than its factorization.

19919159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532256.

The product of its digits is 32805, while the sum is 44.

The square root of 19919159 is about 4463.0885046120. The cubic root of 19919159 is about 271.0755407300.

The spelling of 19919159 in words is "nineteen million, nine hundred nineteen thousand, one hundred fifty-nine".