201040991 has 2 divisors, whose sum is σ = 201040992. Its totient is φ = 201040990.

The previous prime is 201040981. The next prime is 201041041. The reversal of 201040991 is 199040102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201040991 - 2⁶ = 201040927 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201040991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201040901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100520495 + 100520496.

It is an arithmetic number, because the mean of its divisors is an integer number (100520496).

Almost surely, 2^201040991 is an apocalyptic number.

201040991 is a deficient number, since it is larger than the sum of its proper divisors (1).

201040991 is an equidigital number, since it uses as much as digits as its factorization.

201040991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 201040991 is about 14178.8924461680. The cubic root of 201040991 is about 585.8164177386.

The spelling of 201040991 in words is "two hundred one million, forty thousand, nine hundred ninety-one".