11398516991 has 4 divisors (see below), whose sum is σ = 11445813984. Its totient is φ = 11351220000.

The previous prime is 11398516957. The next prime is 11398517023. The reversal of 11398516991 is 19961589311.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11398516991 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 (11398516951) 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, 23648135 + ... + 23648616.

It is an arithmetic number, because the mean of its divisors is an integer number (2861453496).

Almost surely, 2^11398516991 is an apocalyptic number.

11398516991 is a deficient number, since it is larger than the sum of its proper divisors (47296993).

11398516991 is an equidigital number, since it uses as much as digits as its factorization.

11398516991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47296992.

The product of its digits is 524880, while the sum is 53.

The spelling of 11398516991 in words is "eleven billion, three hundred ninety-eight million, five hundred sixteen thousand, nine hundred ninety-one".