11391171798 has 16 divisors (see below), whose sum is σ = 22809507840. Its totient is φ = 3792529896.

The previous prime is 11391171787. The next prime is 11391171809. The reversal of 11391171798 is 89717119311.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11391171787) and next prime (11391171809).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1126390 + ... + 1136457.

It is an arithmetic number, because the mean of its divisors is an integer number (1425594240).

Almost surely, 2^11391171798 is an apocalyptic number.

11391171798 is an abundant number, since it is smaller than the sum of its proper divisors (11418336042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11391171798 is a wasteful number, since it uses less digits than its factorization.

11391171798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263691.

The product of its digits is 95256, while the sum is 48.

The spelling of 11391171798 in words is "eleven billion, three hundred ninety-one million, one hundred seventy-one thousand, seven hundred ninety-eight".