243472091 has 4 divisors (see below), whose sum is σ = 244370784. Its totient is φ = 242573400.

The previous prime is 243472067. The next prime is 243472123. The reversal of 243472091 is 190274342.

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 243472091 - 2¹⁸ = 243209947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243472001) 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, 448940 + ... + 449481.

It is an arithmetic number, because the mean of its divisors is an integer number (61092696).

Almost surely, 2^243472091 is an apocalyptic number.

243472091 is a deficient number, since it is larger than the sum of its proper divisors (898693).

243472091 is an equidigital number, since it uses as much as digits as its factorization.

243472091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898692.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 243472091 is about 15603.5922466591. The cubic root of 243472091 is about 624.4289961395.

The spelling of 243472091 in words is "two hundred forty-three million, four hundred seventy-two thousand, ninety-one".