291640229029 has 2 divisors, whose sum is σ = 291640229030. Its totient is φ = 291640229028.

The previous prime is 291640228991. The next prime is 291640229039. The reversal of 291640229029 is 920922046192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173974078404 + 117666150625 = 417102^2 + 343025^2 .

It is a cyclic number.

It is not a de Polignac number, because 291640229029 - 2²¹ = 291638131877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 291640229029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291640229039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145820114514 + 145820114515.

It is an arithmetic number, because the mean of its divisors is an integer number (145820114515).

Almost surely, 2^291640229029 is an apocalyptic number.

It is an amenable number.

291640229029 is a deficient number, since it is larger than the sum of its proper divisors (1).

291640229029 is an equidigital number, since it uses as much as digits as its factorization.

291640229029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 291640229029 in words is "two hundred ninety-one billion, six hundred forty million, two hundred twenty-nine thousand, twenty-nine".