1009571999873 has 2 divisors, whose sum is σ = 1009571999874. Its totient is φ = 1009571999872.

The previous prime is 1009571999869. The next prime is 1009571999881. The reversal of 1009571999873 is 3789991759001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 572106166129 + 437465833744 = 756377^2 + 661412^2 .

It is a cyclic number.

It is not a de Polignac number, because 1009571999873 - 2² = 1009571999869 is a prime.

It is a super-2 number, since 2×1009571999873² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1009571999473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504785999936 + 504785999937.

It is an arithmetic number, because the mean of its divisors is an integer number (504785999937).

Almost surely, 2^{1009571999873} is an apocalyptic number.

It is an amenable number.

1009571999873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009571999873 is an equidigital number, since it uses as much as digits as its factorization.

1009571999873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38578680, while the sum is 68.

The spelling of 1009571999873 in words is "one trillion, nine billion, five hundred seventy-one million, nine hundred ninety-nine thousand, eight hundred seventy-three".