1011001002001 has 4 divisors (see below), whose sum is σ = 1012464101104. Its totient is φ = 1009537902900.

The previous prime is 1011001001963. The next prime is 1011001002013. The reversal of 1011001002001 is 1002001001101.

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 a de Polignac number, because none of the positive numbers 2^k-1011001002001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011001002041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731548515 + ... + 731549896.

It is an arithmetic number, because the mean of its divisors is an integer number (253116025276).

Almost surely, 2^{1011001002001} is an apocalyptic number.

It is an amenable number.

1011001002001 is a deficient number, since it is larger than the sum of its proper divisors (1463099103).

1011001002001 is an equidigital number, since it uses as much as digits as its factorization.

1011001002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463099102.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 1011001002001 its reverse (1002001001101), we get a palindrome (2013002003102).

The spelling of 1011001002001 in words is "one trillion, eleven billion, one million, two thousand, one".