201083991 has 4 divisors (see below), whose sum is σ = 268111992. Its totient is φ = 134055992.

The previous prime is 201083989. The next prime is 201084047. The reversal of 201083991 is 199380102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201083991 - 2¹ = 201083989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201083591) 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, 33513996 + ... + 33514001.

It is an arithmetic number, because the mean of its divisors is an integer number (67027998).

Almost surely, 2^201083991 is an apocalyptic number.

201083991 is a deficient number, since it is larger than the sum of its proper divisors (67028001).

201083991 is an equidigital number, since it uses as much as digits as its factorization.

201083991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67028000.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 201083991 is about 14180.4087035600. The cubic root of 201083991 is about 585.8581808804.

The spelling of 201083991 in words is "two hundred one million, eighty-three thousand, nine hundred ninety-one".