201491843 has 4 divisors (see below), whose sum is σ = 230276400. Its totient is φ = 172707288.

The previous prime is 201491831. The next prime is 201491897. The reversal of 201491843 is 348194102.

It is a happy number.

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 201491843 - 2⁶ = 201491779 is a prime.

It is a super-3 number, since 3×201491843³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201491813) 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, 14392268 + ... + 14392281.

It is an arithmetic number, because the mean of its divisors is an integer number (57569100).

Almost surely, 2^201491843 is an apocalyptic number.

201491843 is a deficient number, since it is larger than the sum of its proper divisors (28784557).

201491843 is an equidigital number, since it uses as much as digits as its factorization.

201491843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28784556.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 201491843 is about 14194.7822456000. The cubic root of 201491843 is about 586.2540056373.

The spelling of 201491843 in words is "two hundred one million, four hundred ninety-one thousand, eight hundred forty-three".