191948231243 has 4 divisors (see below), whose sum is σ = 193170831600. Its totient is φ = 190725630888.

The previous prime is 191948231231. The next prime is 191948231249. The reversal of 191948231243 is 342132849191.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191948231243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191948231249) 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, 611299943 + ... + 611300256.

It is an arithmetic number, because the mean of its divisors is an integer number (48292707900).

Almost surely, 2^191948231243 is an apocalyptic number.

191948231243 is a deficient number, since it is larger than the sum of its proper divisors (1222600357).

191948231243 is a wasteful number, since it uses less digits than its factorization.

191948231243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222600356.

The product of its digits is 373248, while the sum is 47.

The spelling of 191948231243 in words is "one hundred ninety-one billion, nine hundred forty-eight million, two hundred thirty-one thousand, two hundred forty-three".