191648111 has 2 divisors, whose sum is σ = 191648112. Its totient is φ = 191648110.

The previous prime is 191648081. The next prime is 191648129. The reversal of 191648111 is 111846191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191648111 - 2⁶ = 191648047 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191648131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95824055 + 95824056.

It is an arithmetic number, because the mean of its divisors is an integer number (95824056).

Almost surely, 2^191648111 is an apocalyptic number.

191648111 is a deficient number, since it is larger than the sum of its proper divisors (1).

191648111 is an equidigital number, since it uses as much as digits as its factorization.

191648111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 32.

The square root of 191648111 is about 13843.7029367146. The cubic root of 191648111 is about 576.5471738706.

The spelling of 191648111 in words is "one hundred ninety-one million, six hundred forty-eight thousand, one hundred eleven".