243490091 has 8 divisors (see below), whose sum is σ = 262348800. Its totient is φ = 224649792.

The previous prime is 243490001. The next prime is 243490097. The reversal of 243490091 is 190094342.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243490091 - 2¹⁰ = 243489067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243490097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36566 + ... + 42708.

It is an arithmetic number, because the mean of its divisors is an integer number (32793600).

Almost surely, 2^243490091 is an apocalyptic number.

243490091 is a deficient number, since it is larger than the sum of its proper divisors (18858709).

243490091 is a wasteful number, since it uses less digits than its factorization.

243490091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9205.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 243490091 is about 15604.1690262571. The cubic root of 243490091 is about 624.4443838648. Note that the first 3 decimals are identical.

The spelling of 243490091 in words is "two hundred forty-three million, four hundred ninety thousand, ninety-one".