999648469 has 2 divisors, whose sum is σ = 999648470. Its totient is φ = 999648468.

The previous prime is 999648449. The next prime is 999648487. The reversal of 999648469 is 964846999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 979064100 + 20584369 = 31290^2 + 4537^2 .

It is a cyclic number.

It is not a de Polignac number, because 999648469 - 2⁵ = 999648437 is a prime.

It is a super-3 number, since 3×999648469³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 999648469.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999648449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499824234 + 499824235.

It is an arithmetic number, because the mean of its divisors is an integer number (499824235).

Almost surely, 2^999648469 is an apocalyptic number.

It is an amenable number.

999648469 is a deficient number, since it is larger than the sum of its proper divisors (1).

999648469 is an equidigital number, since it uses as much as digits as its factorization.

999648469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30233088, while the sum is 64.

The square root of 999648469 is about 31617.2179199878. The cubic root of 999648469 is about 999.8828092669.

The spelling of 999648469 in words is "nine hundred ninety-nine million, six hundred forty-eight thousand, four hundred sixty-nine".