191905941 has 4 divisors (see below), whose sum is σ = 255874592. Its totient is φ = 127937292.

The previous prime is 191905907. The next prime is 191905943. The reversal of 191905941 is 149509191.

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 191905941 - 2⁹ = 191905429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191905941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191905943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31984321 + ... + 31984326.

It is an arithmetic number, because the mean of its divisors is an integer number (63968648).

Almost surely, 2^191905941 is an apocalyptic number.

It is an amenable number.

191905941 is a deficient number, since it is larger than the sum of its proper divisors (63968651).

191905941 is an equidigital number, since it uses as much as digits as its factorization.

191905941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63968650.

The product of its (nonzero) digits is 14580, while the sum is 39.

The square root of 191905941 is about 13853.0119829588. The cubic root of 191905941 is about 576.8056067961.

The spelling of 191905941 in words is "one hundred ninety-one million, nine hundred five thousand, nine hundred forty-one".