291011200091 has 4 divisors (see below), whose sum is σ = 292004412672. Its totient is φ = 290017987512.

The previous prime is 291011200063. The next prime is 291011200097. The reversal of 291011200091 is 190002110192.

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 291011200091 - 2³⁴ = 273831330907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 291011200091.

It is not an unprimeable number, because it can be changed into a prime (291011200097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496605851 + ... + 496606436.

It is an arithmetic number, because the mean of its divisors is an integer number (73001103168).

Almost surely, 2^291011200091 is an apocalyptic number.

291011200091 is a deficient number, since it is larger than the sum of its proper divisors (993212581).

291011200091 is an equidigital number, since it uses as much as digits as its factorization.

291011200091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993212580.

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 291011200091 in words is "two hundred ninety-one billion, eleven million, two hundred thousand, ninety-one".