999887653 has 2 divisors, whose sum is σ = 999887654. Its totient is φ = 999887652.

The previous prime is 999887633. The next prime is 999887659. The reversal of 999887653 is 356788999.

It is a happy number.

999887653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855094564 + 144793089 = 29242^2 + 12033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999887653 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999887659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499943826 + 499943827.

It is an arithmetic number, because the mean of its divisors is an integer number (499943827).

Almost surely, 2^999887653 is an apocalyptic number.

It is an amenable number.

999887653 is a deficient number, since it is larger than the sum of its proper divisors (1).

999887653 is an equidigital number, since it uses as much as digits as its factorization.

999887653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29393280, while the sum is 64.

The square root of 999887653 is about 31621.0001897473. Note that the first 3 decimals coincide. The cubic root of 999887653 is about 999.9625495975.

The spelling of 999887653 in words is "nine hundred ninety-nine million, eight hundred eighty-seven thousand, six hundred fifty-three".