989894749 has 2 divisors, whose sum is σ = 989894750. Its totient is φ = 989894748.

The previous prime is 989894747. The next prime is 989894767. The reversal of 989894749 is 947498989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 929335225 + 60559524 = 30485^2 + 7782^2 .

It is an emirp because it is prime and its reverse (947498989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989894749 - 2¹ = 989894747 is a prime.

It is a super-2 number, since 2×989894749² = 1959783228195546002, which contains 22 as substring.

Together with 989894747, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989894747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494947374 + 494947375.

It is an arithmetic number, because the mean of its divisors is an integer number (494947375).

Almost surely, 2^989894749 is an apocalyptic number.

It is an amenable number.

989894749 is a deficient number, since it is larger than the sum of its proper divisors (1).

989894749 is an equidigital number, since it uses as much as digits as its factorization.

989894749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47029248, while the sum is 67.

The square root of 989894749 is about 31462.5928524653. The cubic root of 989894749 is about 996.6201726365.

The spelling of 989894749 in words is "nine hundred eighty-nine million, eight hundred ninety-four thousand, seven hundred forty-nine".