291640228993 has 4 divisors (see below), whose sum is σ = 291709489968. Its totient is φ = 291570968020.

The previous prime is 291640228991. The next prime is 291640229029. The reversal of 291640228993 is 399822046192.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 291640228993 - 2¹ = 291640228991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291640228991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34624171 + ... + 34632592.

It is an arithmetic number, because the mean of its divisors is an integer number (72927372492).

Almost surely, 2^291640228993 is an apocalyptic number.

It is an amenable number.

291640228993 is a deficient number, since it is larger than the sum of its proper divisors (69260975).

291640228993 is an equidigital number, since it uses as much as digits as its factorization.

291640228993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69260974.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 291640228993 in words is "two hundred ninety-one billion, six hundred forty million, two hundred twenty-eight thousand, nine hundred ninety-three".