191948913 has 16 divisors (see below), whose sum is σ = 306243840. Its totient is φ = 118122192.

The previous prime is 191948909. The next prime is 191948923. The reversal of 191948913 is 319849191.

191948913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 191948913 - 2² = 191948909 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (191948923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273081 + ... + 273782.

It is an arithmetic number, because the mean of its divisors is an integer number (19140240).

Almost surely, 2^191948913 is an apocalyptic number.

191948913 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

191948913 is a deficient number, since it is larger than the sum of its proper divisors (114294927).

191948913 is a wasteful number, since it uses less digits than its factorization.

191948913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546885 (or 546879 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 191948913 is about 13854.5628945846. The cubic root of 191948913 is about 576.8486567760.

The spelling of 191948913 in words is "one hundred ninety-one million, nine hundred forty-eight thousand, nine hundred thirteen".