111971649427 has 16 divisors (see below), whose sum is σ = 122712340608. Its totient is φ = 101324802880.

The previous prime is 111971649407. The next prime is 111971649511. The reversal of 111971649427 is 724946179111.

It is a cyclic number.

It is not a de Polignac number, because 111971649427 - 2¹¹ = 111971647379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111971649407) 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 15 ways as a sum of consecutive naturals, for example, 15894768 + ... + 15901810.

It is an arithmetic number, because the mean of its divisors is an integer number (7669521288).

Almost surely, 2^111971649427 is an apocalyptic number.

111971649427 is a deficient number, since it is larger than the sum of its proper divisors (10740691181).

111971649427 is a wasteful number, since it uses less digits than its factorization.

111971649427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13490.

The product of its digits is 762048, while the sum is 52.

The spelling of 111971649427 in words is "one hundred eleven billion, nine hundred seventy-one million, six hundred forty-nine thousand, four hundred twenty-seven".