111101012019989 has 2 divisors, whose sum is σ = 111101012019990. Its totient is φ = 111101012019988.

The previous prime is 111101012019979. The next prime is 111101012020003. The reversal of 111101012019989 is 989910210101111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62374218130225 + 48726793889764 = 7897735^2 + 6980458^2 .

It is a cyclic number.

It is not a de Polignac number, because 111101012019989 - 2²⁴ = 111100995242773 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111101012019979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550506009994 + 55550506009995.

It is an arithmetic number, because the mean of its divisors is an integer number (55550506009995).

Almost surely, 2^{111101012019989} is an apocalyptic number.

It is an amenable number.

111101012019989 is a deficient number, since it is larger than the sum of its proper divisors (1).

111101012019989 is an equidigital number, since it uses as much as digits as its factorization.

111101012019989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 44.

The spelling of 111101012019989 in words is "one hundred eleven trillion, one hundred one billion, twelve million, nineteen thousand, nine hundred eighty-nine".