243500891 has 2 divisors, whose sum is σ = 243500892. Its totient is φ = 243500890.

The previous prime is 243500813. The next prime is 243500897. The reversal of 243500891 is 198005342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243500891 is a prime.

It is a super-3 number, since 3×243500891³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is equal to p_13342838 and since 243500891 and 13342838 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (243500897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121750445 + 121750446.

It is an arithmetic number, because the mean of its divisors is an integer number (121750446).

Almost surely, 2^243500891 is an apocalyptic number.

243500891 is a deficient number, since it is larger than the sum of its proper divisors (1).

243500891 is an equidigital number, since it uses as much as digits as its factorization.

243500891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 243500891 is about 15604.5150837826. The cubic root of 243500891 is about 624.4536161360.

The spelling of 243500891 in words is "two hundred forty-three million, five hundred thousand, eight hundred ninety-one".