989817667 has 2 divisors, whose sum is σ = 989817668. Its totient is φ = 989817666.

The previous prime is 989817643. The next prime is 989817679. The reversal of 989817667 is 766718989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989817667 - 2⁷ = 989817539 is a prime.

It is not a weakly prime, because it can be changed into another prime (989817617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494908833 + 494908834.

It is an arithmetic number, because the mean of its divisors is an integer number (494908834).

Almost surely, 2^989817667 is an apocalyptic number.

989817667 is a deficient number, since it is larger than the sum of its proper divisors (1).

989817667 is an equidigital number, since it uses as much as digits as its factorization.

989817667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 61.

The square root of 989817667 is about 31461.3678501110. The cubic root of 989817667 is about 996.5943033980.

The spelling of 989817667 in words is "nine hundred eighty-nine million, eight hundred seventeen thousand, six hundred sixty-seven".