1002001873 has 2 divisors, whose sum is σ = 1002001874. Its totient is φ = 1002001872.

The previous prime is 1002001769. The next prime is 1002001909. The reversal of 1002001873 is 3781002001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 712729809 + 289272064 = 26697^2 + 17008^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002001873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1002001073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501000936 + 501000937.

It is an arithmetic number, because the mean of its divisors is an integer number (501000937).

Almost surely, 2^1002001873 is an apocalyptic number.

It is an amenable number.

1002001873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002001873 is an equidigital number, since it uses as much as digits as its factorization.

1002001873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1002001873 is about 31654.4131678349. The cubic root of 1002001873 is about 1000.6668462173. Note that the first 3 decimals are identical.

Adding to 1002001873 its reverse (3781002001), we get a palindrome (4783003874).

The spelling of 1002001873 in words is "one billion, two million, one thousand, eight hundred seventy-three".