191011049 has 2 divisors, whose sum is σ = 191011050. Its totient is φ = 191011048.

The previous prime is 191011043. The next prime is 191011063. The reversal of 191011049 is 940110191.

191011049 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105781225 + 85229824 = 10285^2 + 9232^2 .

It is a cyclic number.

It is not a de Polignac number, because 191011049 - 2⁴ = 191011033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_10608353 and since 191011049 and 10608353 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (191011043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95505524 + 95505525.

It is an arithmetic number, because the mean of its divisors is an integer number (95505525).

Almost surely, 2^191011049 is an apocalyptic number.

It is an amenable number.

191011049 is a deficient number, since it is larger than the sum of its proper divisors (1).

191011049 is an equidigital number, since it uses as much as digits as its factorization.

191011049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 191011049 is about 13820.6746940951. The cubic root of 191011049 is about 575.9076266879.

The spelling of 191011049 in words is "one hundred ninety-one million, eleven thousand, forty-nine".