201091243 has 4 divisors (see below), whose sum is σ = 201198600. Its totient is φ = 200983888.

The previous prime is 201091237. The next prime is 201091259. The reversal of 201091243 is 342190102.

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 201091243 - 2⁹ = 201090731 is a prime.

It is a super-2 number, since 2×201091243² = 80875376022570098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201091223) 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, 50818 + ... + 54631.

It is an arithmetic number, because the mean of its divisors is an integer number (50299650).

Almost surely, 2^201091243 is an apocalyptic number.

201091243 is a deficient number, since it is larger than the sum of its proper divisors (107357).

201091243 is a wasteful number, since it uses less digits than its factorization.

201091243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107356.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 201091243 is about 14180.6644061553. The cubic root of 201091243 is about 585.8652236961.

The spelling of 201091243 in words is "two hundred one million, ninety-one thousand, two hundred forty-three".