1009999089797 has 2 divisors, whose sum is σ = 1009999089798. Its totient is φ = 1009999089796.

The previous prime is 1009999089787. The next prime is 1009999089811. The reversal of 1009999089797 is 7979809999001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 943324620001 + 66674469796 = 971249^2 + 258214^2 .

It is a cyclic number.

It is not a de Polignac number, because 1009999089797 - 2⁶ = 1009999089733 is a prime.

It is a super-2 number, since 2×1009999089797² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1009999089787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504999544898 + 504999544899.

It is an arithmetic number, because the mean of its divisors is an integer number (504999544899).

Almost surely, 2^{1009999089797} is an apocalyptic number.

It is an amenable number.

1009999089797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009999089797 is an equidigital number, since it uses as much as digits as its factorization.

1009999089797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 208324872, while the sum is 77.

The spelling of 1009999089797 in words is "one trillion, nine billion, nine hundred ninety-nine million, eighty-nine thousand, seven hundred ninety-seven".