189879995289 has 4 divisors (see below), whose sum is σ = 253173327056. Its totient is φ = 126586663524.

The previous prime is 189879995273. The next prime is 189879995311. The reversal of 189879995289 is 982599978981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 189879995289 - 2⁴ = 189879995273 is a prime.

It is a super-2 number, since 2×189879995289² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189879995089) 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, 31646665879 + ... + 31646665884.

It is an arithmetic number, because the mean of its divisors is an integer number (63293331764).

Almost surely, 2^189879995289 is an apocalyptic number.

It is an amenable number.

189879995289 is a deficient number, since it is larger than the sum of its proper divisors (63293331767).

189879995289 is an equidigital number, since it uses as much as digits as its factorization.

189879995289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63293331766.

The product of its digits is 2116316160, while the sum is 84.

The spelling of 189879995289 in words is "one hundred eighty-nine billion, eight hundred seventy-nine million, nine hundred ninety-five thousand, two hundred eighty-nine".