999765649 has 2 divisors, whose sum is σ = 999765650. Its totient is φ = 999765648.

The previous prime is 999765577. The next prime is 999765653. The reversal of 999765649 is 946567999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 949071249 + 50694400 = 30807^2 + 7120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999765649 is a prime.

It is not a weakly prime, because it can be changed into another prime (999769649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499882824 + 499882825.

It is an arithmetic number, because the mean of its divisors is an integer number (499882825).

Almost surely, 2^999765649 is an apocalyptic number.

It is an amenable number.

999765649 is a deficient number, since it is larger than the sum of its proper divisors (1).

999765649 is an equidigital number, since it uses as much as digits as its factorization.

999765649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33067440, while the sum is 64.

The square root of 999765649 is about 31619.0709699068. The cubic root of 999765649 is about 999.9218768969.

It can be divided in two parts, 99976 and 5649, that added together give a square (105625 = 325²).

The spelling of 999765649 in words is "nine hundred ninety-nine million, seven hundred sixty-five thousand, six hundred forty-nine".