243072091 has 4 divisors (see below), whose sum is σ = 243104184. Its totient is φ = 243040000.

The previous prime is 243072061. The next prime is 243072101. The reversal of 243072091 is 190270342.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 190270342 = 2 ⋅95135171.

It is a cyclic number.

It is not a de Polignac number, because 243072091 - 2⁵ = 243072059 is a prime.

It is a super-2 number, since 2×243072091² = 118168082846224562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243072061) 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 in 3 ways as a sum of consecutive naturals, for example, 2331 + ... + 22171.

It is an arithmetic number, because the mean of its divisors is an integer number (60776046).

Almost surely, 2^243072091 is an apocalyptic number.

243072091 is a deficient number, since it is larger than the sum of its proper divisors (32093).

243072091 is a wasteful number, since it uses less digits than its factorization.

243072091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32092.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 243072091 is about 15590.7694165490. The cubic root of 243072091 is about 624.0868508235.

The spelling of 243072091 in words is "two hundred forty-three million, seventy-two thousand, ninety-one".