201081811 has 8 divisors (see below), whose sum is σ = 229950560. Its totient is φ = 172248768.

The previous prime is 201081787. The next prime is 201081817. The reversal of 201081811 is 118180102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201081811 - 2²¹ = 198984659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201081817) 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 7 ways as a sum of consecutive naturals, for example, 4495 + ... + 20551.

It is an arithmetic number, because the mean of its divisors is an integer number (28743820).

Almost surely, 2^201081811 is an apocalyptic number.

201081811 is a deficient number, since it is larger than the sum of its proper divisors (28868749).

201081811 is a wasteful number, since it uses less digits than its factorization.

201081811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17853.

The product of its (nonzero) digits is 128, while the sum is 22.

The square root of 201081811 is about 14180.3318367378. The cubic root of 201081811 is about 585.8560637295.

The spelling of 201081811 in words is "two hundred one million, eighty-one thousand, eight hundred eleven".