111211232031989 has 2 divisors, whose sum is σ = 111211232031990. Its totient is φ = 111211232031988.

The previous prime is 111211232031941. The next prime is 111211232032007. The reversal of 111211232031989 is 989130232112111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102858987531364 + 8352244500625 = 10141942^2 + 2890025^2 .

It is a cyclic number.

It is not a de Polignac number, because 111211232031989 - 2³² = 111206937064693 is a prime.

It is a super-2 number, since 2×111211232031989² (a number of 29 digits) contains 22 as substring.

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 (111211232031689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605616015994 + 55605616015995.

It is an arithmetic number, because the mean of its divisors is an integer number (55605616015995).

Almost surely, 2^{111211232031989} is an apocalyptic number.

It is an amenable number.

111211232031989 is a deficient number, since it is larger than the sum of its proper divisors (1).

111211232031989 is an equidigital number, since it uses as much as digits as its factorization.

111211232031989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 44.

The spelling of 111211232031989 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred thirty-two million, thirty-one thousand, nine hundred eighty-nine".