243613091 has 2 divisors, whose sum is σ = 243613092. Its totient is φ = 243613090.

The previous prime is 243613067. The next prime is 243613121. The reversal of 243613091 is 190316342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243613091 - 2²⁶ = 176504227 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243613691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121806545 + 121806546.

It is an arithmetic number, because the mean of its divisors is an integer number (121806546).

Almost surely, 2^243613091 is an apocalyptic number.

243613091 is a deficient number, since it is larger than the sum of its proper divisors (1).

243613091 is an equidigital number, since it uses as much as digits as its factorization.

243613091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 243613091 is about 15608.1097830583. The cubic root of 243613091 is about 624.5495130297.

The spelling of 243613091 in words is "two hundred forty-three million, six hundred thirteen thousand, ninety-one".