243679091 has 4 divisors (see below), whose sum is σ = 245597952. Its totient is φ = 241760232.

The previous prime is 243679061. The next prime is 243679097. The reversal of 243679091 is 190976342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243679091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243679097) 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, 959240 + ... + 959493.

It is an arithmetic number, because the mean of its divisors is an integer number (61399488).

Almost surely, 2^243679091 is an apocalyptic number.

243679091 is a deficient number, since it is larger than the sum of its proper divisors (1918861).

243679091 is a wasteful number, since it uses less digits than its factorization.

243679091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918860.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 243679091 is about 15610.2239253638. The cubic root of 243679091 is about 624.6059092135.

The spelling of 243679091 in words is "two hundred forty-three million, six hundred seventy-nine thousand, ninety-one".