2001191156 has 12 divisors (see below), whose sum is σ = 3504597600. Its totient is φ = 999877560.

The previous prime is 2001191149. The next prime is 2001191183. The reversal of 2001191156 is 6511911002.

It is a congruent number.

It is an unprimeable number.

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, 173210 + ... + 184401.

It is an arithmetic number, because the mean of its divisors is an integer number (292049800).

Almost surely, 2^2001191156 is an apocalyptic number.

It is an amenable number.

2001191156 is a deficient number, since it is larger than the sum of its proper divisors (1503406444).

2001191156 is a wasteful number, since it uses less digits than its factorization.

2001191156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359014 (or 359012 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 26.

The square root of 2001191156 is about 44734.6750966183. The cubic root of 2001191156 is about 1260.1711273409.

The spelling of 2001191156 in words is "two billion, one million, one hundred ninety-one thousand, one hundred fifty-six".