291397668479 has 4 divisors (see below), whose sum is σ = 291431470176. Its totient is φ = 291363866784.

The previous prime is 291397668461. The next prime is 291397668547. The reversal of 291397668479 is 974866793192.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 291397668479 - 2¹⁶ = 291397602943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291397668449) 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 in 3 ways as a sum of consecutive naturals, for example, 16887914 + ... + 16905159.

It is an arithmetic number, because the mean of its divisors is an integer number (72857867544).

Almost surely, 2^291397668479 is an apocalyptic number.

291397668479 is a deficient number, since it is larger than the sum of its proper divisors (33801697).

291397668479 is an equidigital number, since it uses as much as digits as its factorization.

291397668479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33801696.

The product of its digits is 246903552, while the sum is 71.

The spelling of 291397668479 in words is "two hundred ninety-one billion, three hundred ninety-seven million, six hundred sixty-eight thousand, four hundred seventy-nine".