989892749 has 2 divisors, whose sum is σ = 989892750. Its totient is φ = 989892748.

The previous prime is 989892719. The next prime is 989892793. The reversal of 989892749 is 947298989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 593166025 + 396726724 = 24355^2 + 19918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989892749 is a prime.

It is a Chen prime.

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 (989892719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494946374 + 494946375.

It is an arithmetic number, because the mean of its divisors is an integer number (494946375).

Almost surely, 2^989892749 is an apocalyptic number.

It is an amenable number.

989892749 is a deficient number, since it is larger than the sum of its proper divisors (1).

989892749 is an equidigital number, since it uses as much as digits as its factorization.

989892749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23514624, while the sum is 65.

The square root of 989892749 is about 31462.5610686734. The cubic root of 989892749 is about 996.6195014400.

The spelling of 989892749 in words is "nine hundred eighty-nine million, eight hundred ninety-two thousand, seven hundred forty-nine".