111581990827 has 2 divisors, whose sum is σ = 111581990828. Its totient is φ = 111581990826.

The previous prime is 111581990813. The next prime is 111581990837. The reversal of 111581990827 is 728099185111.

It is a strong prime.

It is an emirp because it is prime and its reverse (728099185111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111581990827 - 2²³ = 111573602219 is a prime.

It is not a weakly prime, because it can be changed into another prime (111581990837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55790995413 + 55790995414.

It is an arithmetic number, because the mean of its divisors is an integer number (55790995414).

Almost surely, 2^111581990827 is an apocalyptic number.

111581990827 is a deficient number, since it is larger than the sum of its proper divisors (1).

111581990827 is an equidigital number, since it uses as much as digits as its factorization.

111581990827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 52.

The spelling of 111581990827 in words is "one hundred eleven billion, five hundred eighty-one million, nine hundred ninety thousand, eight hundred twenty-seven".