191004641 has 2 divisors, whose sum is σ = 191004642. Its totient is φ = 191004640.

The previous prime is 191004623. The next prime is 191004659. The reversal of 191004641 is 146400191.

It is a balanced prime because it is at equal distance from previous prime (191004623) and next prime (191004659).

It can be written as a sum of positive squares in only one way, i.e., 108576400 + 82428241 = 10420^2 + 9079^2 .

It is a cyclic number.

It is not a de Polignac number, because 191004641 - 2²⁶ = 123895777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 191004641.

It is not a weakly prime, because it can be changed into another prime (191004601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95502320 + 95502321.

It is an arithmetic number, because the mean of its divisors is an integer number (95502321).

Almost surely, 2^191004641 is an apocalyptic number.

It is an amenable number.

191004641 is a deficient number, since it is larger than the sum of its proper divisors (1).

191004641 is an equidigital number, since it uses as much as digits as its factorization.

191004641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 191004641 is about 13820.4428655525. The cubic root of 191004641 is about 575.9011864718.

The spelling of 191004641 in words is "one hundred ninety-one million, four thousand, six hundred forty-one".