201940891 has 4 divisors (see below), whose sum is σ = 208904400. Its totient is φ = 194977384.

The previous prime is 201940883. The next prime is 201940901. The reversal of 201940891 is 198049102.

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 201940891 - 2³ = 201940883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201940801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3481711 + ... + 3481768.

It is an arithmetic number, because the mean of its divisors is an integer number (52226100).

Almost surely, 2^201940891 is an apocalyptic number.

201940891 is a deficient number, since it is larger than the sum of its proper divisors (6963509).

201940891 is an equidigital number, since it uses as much as digits as its factorization.

201940891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6963508.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 201940891 is about 14210.5908040447. The cubic root of 201940891 is about 586.6891942466.

Adding to 201940891 its reverse (198049102), we get a palindrome (399989993).

The spelling of 201940891 in words is "two hundred one million, nine hundred forty thousand, eight hundred ninety-one".