111691357959 has 4 divisors (see below), whose sum is σ = 148921810616. Its totient is φ = 74460905304.

The previous prime is 111691357933. The next prime is 111691358021. The reversal of 111691357959 is 959753196111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959753196111 = 3 ⋅319917732037.

It is not a de Polignac number, because 111691357959 - 2⁵ = 111691357927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111691357899 and 111691357908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111691357159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18615226324 + ... + 18615226329.

It is an arithmetic number, because the mean of its divisors is an integer number (37230452654).

Almost surely, 2^111691357959 is an apocalyptic number.

111691357959 is a deficient number, since it is larger than the sum of its proper divisors (37230452657).

111691357959 is an equidigital number, since it uses as much as digits as its factorization.

111691357959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37230452656.

The product of its digits is 2296350, while the sum is 57.

The spelling of 111691357959 in words is "one hundred eleven billion, six hundred ninety-one million, three hundred fifty-seven thousand, nine hundred fifty-nine".