291640228991 has 2 divisors, whose sum is σ = 291640228992. Its totient is φ = 291640228990.

The previous prime is 291640228973. The next prime is 291640229029. The reversal of 291640228991 is 199822046192.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 291640228991 - 2¹⁴ = 291640212607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291640258991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145820114495 + 145820114496.

It is an arithmetic number, because the mean of its divisors is an integer number (145820114496).

Almost surely, 2^291640228991 is an apocalyptic number.

291640228991 is a deficient number, since it is larger than the sum of its proper divisors (1).

291640228991 is an equidigital number, since it uses as much as digits as its factorization.

291640228991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The spelling of 291640228991 in words is "two hundred ninety-one billion, six hundred forty million, two hundred twenty-eight thousand, nine hundred ninety-one".