116381989 has 2 divisors, whose sum is σ = 116381990. Its totient is φ = 116381988.

The previous prime is 116381987. The next prime is 116382023. The reversal of 116381989 is 989183611.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116273089 + 108900 = 10783^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 116381989 - 2¹ = 116381987 is a prime.

It is a super-2 number, since 2×116381989² = 27089534727192242, which contains 22 as substring.

Together with 116381987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (116381981) 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, 58190994 + 58190995.

It is an arithmetic number, because the mean of its divisors is an integer number (58190995).

Almost surely, 2^116381989 is an apocalyptic number.

It is an amenable number.

116381989 is a deficient number, since it is larger than the sum of its proper divisors (1).

116381989 is an equidigital number, since it uses as much as digits as its factorization.

116381989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 46.

The square root of 116381989 is about 10788.0484333358. The cubic root of 116381989 is about 488.2346428816.

It can be divided in two parts, 116381 and 989, that added together give a triangular number (117370 = T₄₈₄).

The spelling of 116381989 in words is "one hundred sixteen million, three hundred eighty-one thousand, nine hundred eighty-nine".