191959141 has 4 divisors (see below), whose sum is σ = 209409984. Its totient is φ = 174508300.

The previous prime is 191959123. The next prime is 191959213. The reversal of 191959141 is 141959191.

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, and also an emirpimes, since its reverse is a distinct semiprime: 141959191 = 11 ⋅12905381.

It is a cyclic number.

It is not a de Polignac number, because 191959141 - 2⁷ = 191959013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191959094 and 191959103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191959241) 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, 8725405 + ... + 8725426.

It is an arithmetic number, because the mean of its divisors is an integer number (52352496).

Almost surely, 2^191959141 is an apocalyptic number.

191959141 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

191959141 is a deficient number, since it is larger than the sum of its proper divisors (17450843).

191959141 is a wasteful number, since it uses less digits than its factorization.

191959141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17450842.

The product of its digits is 14580, while the sum is 40.

The square root of 191959141 is about 13854.9320099378. The cubic root of 191959141 is about 576.8589023897.

The spelling of 191959141 in words is "one hundred ninety-one million, nine hundred fifty-nine thousand, one hundred forty-one".