243745091 has 4 divisors (see below), whose sum is σ = 256573800. Its totient is φ = 230916384.

The previous prime is 243745069. The next prime is 243745093. The reversal of 243745091 is 190547342.

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 243745091 - 2¹⁸ = 243482947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243745093) 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, 6414326 + ... + 6414363.

It is an arithmetic number, because the mean of its divisors is an integer number (64143450).

Almost surely, 2^243745091 is an apocalyptic number.

243745091 is a deficient number, since it is larger than the sum of its proper divisors (12828709).

243745091 is a wasteful number, since it uses less digits than its factorization.

243745091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12828708.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 243745091 is about 15612.3377813830. The cubic root of 243745091 is about 624.6622952150.

The spelling of 243745091 in words is "two hundred forty-three million, seven hundred forty-five thousand, ninety-one".