111691330971 has 12 divisors (see below), whose sum is σ = 163690876776. Its totient is φ = 67691715520.

The previous prime is 111691330967. The next prime is 111691330979. The reversal of 111691330971 is 179033196111.

It is not a de Polignac number, because 111691330971 - 2² = 111691330967 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111691330979) 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 11 ways as a sum of consecutive naturals, for example, 153844446 + ... + 153845171.

It is an arithmetic number, because the mean of its divisors is an integer number (13640906398).

Almost surely, 2^111691330971 is an apocalyptic number.

111691330971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111691330971 is a deficient number, since it is larger than the sum of its proper divisors (51999545805).

111691330971 is a wasteful number, since it uses less digits than its factorization.

111691330971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307689642 (or 307689631 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 42.

It can be divided in two parts, 11 and 1691330971, that multiplied together give a palindrome (18604640681).

The spelling of 111691330971 in words is "one hundred eleven billion, six hundred ninety-one million, three hundred thirty thousand, nine hundred seventy-one".