118211261491 has 4 divisors (see below), whose sum is σ = 118285098984. Its totient is φ = 118137424000.

The previous prime is 118211261461. The next prime is 118211261501. The reversal of 118211261491 is 194162112811.

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 118211261491 - 2³⁵ = 83851523123 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 118211261491.

It is not an unprimeable number, because it can be changed into a prime (118211261461) 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, 36916345 + ... + 36919546.

It is an arithmetic number, because the mean of its divisors is an integer number (29571274746).

Almost surely, 2^118211261491 is an apocalyptic number.

118211261491 is a deficient number, since it is larger than the sum of its proper divisors (73837493).

118211261491 is an equidigital number, since it uses as much as digits as its factorization.

118211261491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73837492.

The product of its digits is 6912, while the sum is 37.

The spelling of 118211261491 in words is "one hundred eighteen billion, two hundred eleven million, two hundred sixty-one thousand, four hundred ninety-one".