1000001099961 has 12 divisors (see below), whose sum is σ = 1444718793492. Its totient is φ = 666541510656.

The previous prime is 1000001099959. The next prime is 1000001100047. The reversal of 1000001099961 is 1699901000001.

It can be written as a sum of positive squares in 2 ways, for example, as 932228870400 + 67772229561 = 965520^2 + 260331^2 .

It is not a de Polignac number, because 1000001099961 - 2¹ = 1000001099959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1000001099261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10440456 + ... + 10535801.

It is an arithmetic number, because the mean of its divisors is an integer number (120393232791).

Almost surely, 2^{1000001099961} is an apocalyptic number.

It is an amenable number.

1000001099961 is a deficient number, since it is larger than the sum of its proper divisors (444717693531).

1000001099961 is a wasteful number, since it uses less digits than its factorization.

1000001099961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20981560 (or 20981557 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

Adding to 1000001099961 its reverse (1699901000001), we get a palindrome (2699902099962).

The spelling of 1000001099961 in words is "one trillion, one million, ninety-nine thousand, nine hundred sixty-one".