1000099991801 has 2 divisors, whose sum is σ = 1000099991802. Its totient is φ = 1000099991800.

The previous prime is 1000099991771. The next prime is 1000099991861. The reversal of 1000099991801 is 1081999900001.

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., 703375755625 + 296724236176 = 838675^2 + 544724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000099991801 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1000099991861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500049995900 + 500049995901.

It is an arithmetic number, because the mean of its divisors is an integer number (500049995901).

Almost surely, 2^{1000099991801} is an apocalyptic number.

It is an amenable number.

1000099991801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000099991801 is an equidigital number, since it uses as much as digits as its factorization.

1000099991801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 47.

The spelling of 1000099991801 in words is "one trillion, ninety-nine million, nine hundred ninety-one thousand, eight hundred one".