2001099123869 has 2 divisors, whose sum is σ = 2001099123870. Its totient is φ = 2001099123868.

The previous prime is 2001099123857. The next prime is 2001099123883. The reversal of 2001099123869 is 9683219901002.

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., 1354139505625 + 646959618244 = 1163675^2 + 804338^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001099123869 - 2⁸ = 2001099123613 is a prime.

It is a super-2 number, since 2×2001099123869² (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 (2001099123889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000549561934 + 1000549561935.

It is an arithmetic number, because the mean of its divisors is an integer number (1000549561935).

Almost surely, 2^{2001099123869} is an apocalyptic number.

It is an amenable number.

2001099123869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001099123869 is an equidigital number, since it uses as much as digits as its factorization.

2001099123869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 50.

The spelling of 2001099123869 in words is "two trillion, one billion, ninety-nine million, one hundred twenty-three thousand, eight hundred sixty-nine".