989649671 has 2 divisors, whose sum is σ = 989649672. Its totient is φ = 989649670.

The previous prime is 989649667. The next prime is 989649709. The reversal of 989649671 is 176946989.

It is a weak prime.

It is an emirp because it is prime and its reverse (176946989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989649671 - 2² = 989649667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 989649671.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989649641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494824835 + 494824836.

It is an arithmetic number, because the mean of its divisors is an integer number (494824836).

Almost surely, 2^989649671 is an apocalyptic number.

989649671 is a deficient number, since it is larger than the sum of its proper divisors (1).

989649671 is an equidigital number, since it uses as much as digits as its factorization.

989649671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 59.

The square root of 989649671 is about 31458.6978592567. The cubic root of 989649671 is about 996.5379181548.

The spelling of 989649671 in words is "nine hundred eighty-nine million, six hundred forty-nine thousand, six hundred seventy-one".