291049691 has 2 divisors, whose sum is σ = 291049692. Its totient is φ = 291049690.

The previous prime is 291049687. The next prime is 291049697. The reversal of 291049691 is 196940192.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 291049691 - 2² = 291049687 is a prime.

It is not a weakly prime, because it can be changed into another prime (291049697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145524845 + 145524846.

It is an arithmetic number, because the mean of its divisors is an integer number (145524846).

Almost surely, 2^291049691 is an apocalyptic number.

291049691 is a deficient number, since it is larger than the sum of its proper divisors (1).

291049691 is an equidigital number, since it uses as much as digits as its factorization.

291049691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 291049691 is about 17060.1785160648. The cubic root of 291049691 is about 662.7082556865.

The spelling of 291049691 in words is "two hundred ninety-one million, forty-nine thousand, six hundred ninety-one".