191980441 has 4 divisors (see below), whose sum is σ = 192075300. Its totient is φ = 191885584.

The previous prime is 191980421. The next prime is 191980463. The reversal of 191980441 is 144089191.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20894041 + 171086400 = 4571^2 + 13080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191980441 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 191980441.

It is not an unprimeable number, because it can be changed into a prime (191980421) 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, 44326 + ... + 48463.

It is an arithmetic number, because the mean of its divisors is an integer number (48018825).

Almost surely, 2^191980441 is an apocalyptic number.

It is an amenable number.

191980441 is a deficient number, since it is larger than the sum of its proper divisors (94859).

191980441 is an equidigital number, since it uses as much as digits as its factorization.

191980441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94858.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 191980441 is about 13855.7006679561. The cubic root of 191980441 is about 576.8802379026.

The spelling of 191980441 in words is "one hundred ninety-one million, nine hundred eighty thousand, four hundred forty-one".