2001231309977 has 4 divisors (see below), whose sum is σ = 2106559273680. Its totient is φ = 1895903346276.

The previous prime is 2001231309967. The next prime is 2001231310007. The reversal of 2001231309977 is 7799031321002.

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 2001231309977 - 2¹² = 2001231305881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001231309967) 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, 52663981823 + ... + 52663981860.

It is an arithmetic number, because the mean of its divisors is an integer number (526639818420).

Almost surely, 2^{2001231309977} is an apocalyptic number.

It is an amenable number.

2001231309977 is a deficient number, since it is larger than the sum of its proper divisors (105327963703).

2001231309977 is a wasteful number, since it uses less digits than its factorization.

2001231309977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105327963702.

The product of its (nonzero) digits is 142884, while the sum is 44.

The spelling of 2001231309977 in words is "two trillion, one billion, two hundred thirty-one million, three hundred nine thousand, nine hundred seventy-seven".