999648061 has 2 divisors, whose sum is σ = 999648062. Its totient is φ = 999648060.

The previous prime is 999647993. The next prime is 999648073. The reversal of 999648061 is 160846999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 916272900 + 83375161 = 30270^2 + 9131^2 .

It is an emirp because it is prime and its reverse (160846999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999648061 - 2¹⁹ = 999123773 is a prime.

It is a super-2 number, since 2×999648061² = 1998592491722119442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999645061) 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, 499824030 + 499824031.

It is an arithmetic number, because the mean of its divisors is an integer number (499824031).

Almost surely, 2^999648061 is an apocalyptic number.

It is an amenable number.

999648061 is a deficient number, since it is larger than the sum of its proper divisors (1).

999648061 is an equidigital number, since it uses as much as digits as its factorization.

999648061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 999648061 is about 31617.2114678066. The cubic root of 999648061 is about 999.8826732350.

The spelling of 999648061 in words is "nine hundred ninety-nine million, six hundred forty-eight thousand, sixty-one".