1010111989 has 2 divisors, whose sum is σ = 1010111990. Its totient is φ = 1010111988.

The previous prime is 1010111983. The next prime is 1010112007. The reversal of 1010111989 is 9891110101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 710648964 + 299463025 = 26658^2 + 17305^2 .

It is an emirp because it is prime and its reverse (9891110101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1010111989 - 2⁹ = 1010111477 is a prime.

It is a super-2 number, since 2×1010111989² = 2040652460643072242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1010111989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1010111983) 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 as a sum of consecutive naturals, namely, 505055994 + 505055995.

It is an arithmetic number, because the mean of its divisors is an integer number (505055995).

Almost surely, 2^1010111989 is an apocalyptic number.

It is an amenable number.

1010111989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010111989 is an equidigital number, since it uses as much as digits as its factorization.

1010111989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 31.

The square root of 1010111989 is about 31782.2590292131. The cubic root of 1010111989 is about 1003.3593650294.

The spelling of 1010111989 in words is "one billion, ten million, one hundred eleven thousand, nine hundred eighty-nine".