291148049 has 2 divisors, whose sum is σ = 291148050. Its totient is φ = 291148048.

The previous prime is 291148021. The next prime is 291148057. The reversal of 291148049 is 940841192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156750400 + 134397649 = 12520^2 + 11593^2 .

It is a cyclic number.

It is not a de Polignac number, because 291148049 - 2⁸ = 291147793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (291148009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145574024 + 145574025.

It is an arithmetic number, because the mean of its divisors is an integer number (145574025).

Almost surely, 2^291148049 is an apocalyptic number.

It is an amenable number.

291148049 is a deficient number, since it is larger than the sum of its proper divisors (1).

291148049 is an equidigital number, since it uses as much as digits as its factorization.

291148049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 291148049 is about 17063.0609504860. The cubic root of 291148049 is about 662.7828996612.

The spelling of 291148049 in words is "two hundred ninety-one million, one hundred forty-eight thousand, forty-nine".