889172749 has 2 divisors, whose sum is σ = 889172750. Its totient is φ = 889172748.

The previous prime is 889172737. The next prime is 889172807. The reversal of 889172749 is 947271988.

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., 886967524 + 2205225 = 29782^2 + 1485^2 .

It is a cyclic number.

It is not a de Polignac number, because 889172749 - 2¹⁹ = 888648461 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 889172749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (889176749) 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, 444586374 + 444586375.

It is an arithmetic number, because the mean of its divisors is an integer number (444586375).

Almost surely, 2^889172749 is an apocalyptic number.

It is an amenable number.

889172749 is a deficient number, since it is larger than the sum of its proper divisors (1).

889172749 is an equidigital number, since it uses as much as digits as its factorization.

889172749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 55.

The square root of 889172749 is about 29818.9997987860. Note that the first 3 decimals coincide. The cubic root of 889172749 is about 961.6020519262.

The spelling of 889172749 in words is "eight hundred eighty-nine million, one hundred seventy-two thousand, seven hundred forty-nine".