172243518919 has 2 divisors, whose sum is σ = 172243518920. Its totient is φ = 172243518918.

The previous prime is 172243518857. The next prime is 172243518983. The reversal of 172243518919 is 919815342271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172243518919 - 2¹⁹ = 172242994631 is a prime.

It is a super-2 number, since 2×172243518919² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172243518989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86121759459 + 86121759460.

It is an arithmetic number, because the mean of its divisors is an integer number (86121759460).

Almost surely, 2^172243518919 is an apocalyptic number.

172243518919 is a deficient number, since it is larger than the sum of its proper divisors (1).

172243518919 is an equidigital number, since it uses as much as digits as its factorization.

172243518919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 52.

The spelling of 172243518919 in words is "one hundred seventy-two billion, two hundred forty-three million, five hundred eighteen thousand, nine hundred nineteen".