1202010011991 has 16 divisors (see below), whose sum is σ = 1780873344000. Its totient is φ = 801287011224.

The previous prime is 1202010011963. The next prime is 1202010012011. The reversal of 1202010011991 is 1991100102021.

It is not a de Polignac number, because 1202010011991 - 2²¹ = 1202007914839 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202010011591) 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 15 ways as a sum of consecutive naturals, for example, 1054161 + ... + 1874906.

It is an arithmetic number, because the mean of its divisors is an integer number (111304584000).

Almost surely, 2^{1202010011991} is an apocalyptic number.

1202010011991 is a deficient number, since it is larger than the sum of its proper divisors (578863332009).

1202010011991 is a wasteful number, since it uses less digits than its factorization.

1202010011991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2944275 (or 2944269 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

The spelling of 1202010011991 in words is "one trillion, two hundred two billion, ten million, eleven thousand, nine hundred ninety-one".