291440917093 has 2 divisors, whose sum is σ = 291440917094. Its totient is φ = 291440917092.

The previous prime is 291440917081. The next prime is 291440917111. The reversal of 291440917093 is 390719044192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 283260257284 + 8180659809 = 532222^2 + 90447^2 .

It is a cyclic number.

It is not a de Polignac number, because 291440917093 - 2¹³ = 291440908901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291440917003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145720458546 + 145720458547.

It is an arithmetic number, because the mean of its divisors is an integer number (145720458547).

Almost surely, 2^291440917093 is an apocalyptic number.

It is an amenable number.

291440917093 is a deficient number, since it is larger than the sum of its proper divisors (1).

291440917093 is an equidigital number, since it uses as much as digits as its factorization.

291440917093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 291440917093 in words is "two hundred ninety-one billion, four hundred forty million, nine hundred seventeen thousand, ninety-three".