243598891 has 2 divisors, whose sum is σ = 243598892. Its totient is φ = 243598890.

The previous prime is 243598877. The next prime is 243598903. The reversal of 243598891 is 198895342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243598891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243598841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121799445 + 121799446.

It is an arithmetic number, because the mean of its divisors is an integer number (121799446).

Almost surely, 2^243598891 is an apocalyptic number.

243598891 is a deficient number, since it is larger than the sum of its proper divisors (1).

243598891 is an equidigital number, since it uses as much as digits as its factorization.

243598891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 49.

The square root of 243598891 is about 15607.6548847032. The cubic root of 243598891 is about 624.5373779739.

The spelling of 243598891 in words is "two hundred forty-three million, five hundred ninety-eight thousand, eight hundred ninety-one".