19317139 has 4 divisors (see below), whose sum is σ = 19333024. Its totient is φ = 19301256.

The previous prime is 19317127. The next prime is 19317169. The reversal of 19317139 is 93171391.

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

It is a cyclic number.

It is not a de Polignac number, because 19317139 - 2¹¹ = 19315091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19317169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5952 + ... + 8605.

It is an arithmetic number, because the mean of its divisors is an integer number (4833256).

Almost surely, 2^19317139 is an apocalyptic number.

19317139 is a deficient number, since it is larger than the sum of its proper divisors (15885).

19317139 is a wasteful number, since it uses less digits than its factorization.

19317139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15884.

The product of its digits is 5103, while the sum is 34.

The square root of 19317139 is about 4395.1267330988. The cubic root of 19317139 is about 268.3166367794.

The spelling of 19317139 in words is "nineteen million, three hundred seventeen thousand, one hundred thirty-nine".