191480921 has 2 divisors, whose sum is σ = 191480922. Its totient is φ = 191480920.

The previous prime is 191480909. The next prime is 191480923. The reversal of 191480921 is 129084191.

191480921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121992025 + 69488896 = 11045^2 + 8336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191480921 is a prime.

Together with 191480923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (191480923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95740460 + 95740461.

It is an arithmetic number, because the mean of its divisors is an integer number (95740461).

Almost surely, 2^191480921 is an apocalyptic number.

It is an amenable number.

191480921 is a deficient number, since it is larger than the sum of its proper divisors (1).

191480921 is an equidigital number, since it uses as much as digits as its factorization.

191480921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 191480921 is about 13837.6631336364. The cubic root of 191480921 is about 576.3794689982.

The spelling of 191480921 in words is "one hundred ninety-one million, four hundred eighty thousand, nine hundred twenty-one".