116987989 has 2 divisors, whose sum is σ = 116987990. Its totient is φ = 116987988.

The previous prime is 116987977. The next prime is 116988007. The reversal of 116987989 is 989789611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116100625 + 887364 = 10775^2 + 942^2 .

It is an emirp because it is prime and its reverse (989789611) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-116987989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (116987909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58493994 + 58493995.

It is an arithmetic number, because the mean of its divisors is an integer number (58493995).

Almost surely, 2^116987989 is an apocalyptic number.

It is an amenable number.

116987989 is a deficient number, since it is larger than the sum of its proper divisors (1).

116987989 is an equidigital number, since it uses as much as digits as its factorization.

116987989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 58.

The square root of 116987989 is about 10816.0986034707. The cubic root of 116987989 is about 489.0805874742.

The spelling of 116987989 in words is "one hundred sixteen million, nine hundred eighty-seven thousand, nine hundred eighty-nine".