243982891 has 2 divisors, whose sum is σ = 243982892. Its totient is φ = 243982890.

The previous prime is 243982853. The next prime is 243982897. The reversal of 243982891 is 198289342.

243982891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243982891 - 2⁹ = 243982379 is a prime.

It is a super-2 number, since 2×243982891² = 119055302201435762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243982897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121991445 + 121991446.

It is an arithmetic number, because the mean of its divisors is an integer number (121991446).

Almost surely, 2^243982891 is an apocalyptic number.

243982891 is a deficient number, since it is larger than the sum of its proper divisors (1).

243982891 is an equidigital number, since it uses as much as digits as its factorization.

243982891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 46.

The square root of 243982891 is about 15619.9516964682. The cubic root of 243982891 is about 624.8653713223.

The spelling of 243982891 in words is "two hundred forty-three million, nine hundred eighty-two thousand, eight hundred ninety-one".