189991370293 has 4 divisors (see below), whose sum is σ = 190025068320. Its totient is φ = 189957672268.

The previous prime is 189991370287. The next prime is 189991370329. The reversal of 189991370293 is 392073199981.

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 a cyclic number.

It is not a de Polignac number, because 189991370293 - 2⁹ = 189991369781 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 (189991370273) 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, 16840555 + ... + 16851832.

It is an arithmetic number, because the mean of its divisors is an integer number (47506267080).

Almost surely, 2^189991370293 is an apocalyptic number.

It is an amenable number.

189991370293 is a deficient number, since it is larger than the sum of its proper divisors (33698027).

189991370293 is an equidigital number, since it uses as much as digits as its factorization.

189991370293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33698026.

The product of its (nonzero) digits is 6613488, while the sum is 61.

The spelling of 189991370293 in words is "one hundred eighty-nine billion, nine hundred ninety-one million, three hundred seventy thousand, two hundred ninety-three".