1081999900001 has 4 divisors (see below), whose sum is σ = 1082043345600. Its totient is φ = 1081956454404.

The previous prime is 1081999899977. The next prime is 1081999900057. The reversal of 1081999900001 is 1000099991801.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1081999900001 - 2³⁸ = 807121993057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1081999900081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21685421 + ... + 21735258.

It is an arithmetic number, because the mean of its divisors is an integer number (270510836400).

Almost surely, 2^{1081999900001} is an apocalyptic number.

It is an amenable number.

1081999900001 is a deficient number, since it is larger than the sum of its proper divisors (43445599).

1081999900001 is an equidigital number, since it uses as much as digits as its factorization.

1081999900001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43445598.

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

The spelling of 1081999900001 in words is "one trillion, eighty-one billion, nine hundred ninety-nine million, nine hundred thousand, one".