243919969 has 2 divisors, whose sum is σ = 243919970. Its totient is φ = 243919968.

The previous prime is 243919933. The next prime is 243919981. The reversal of 243919969 is 969919342.

243919969 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 can be written as a sum of positive squares in only one way, i.e., 190440000 + 53479969 = 13800^2 + 7313^2 .

It is a cyclic number.

It is not a de Polignac number, because 243919969 - 2²¹ = 241822817 is a prime.

It is a super-2 number, since 2×243919969² = 118993902553921922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243910969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121959984 + 121959985.

It is an arithmetic number, because the mean of its divisors is an integer number (121959985).

Almost surely, 2^243919969 is an apocalyptic number.

It is an amenable number.

243919969 is a deficient number, since it is larger than the sum of its proper divisors (1).

243919969 is an equidigital number, since it uses as much as digits as its factorization.

243919969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 944784, while the sum is 52.

The square root of 243919969 is about 15617.9374118351. The cubic root of 243919969 is about 624.8116501246.

The spelling of 243919969 in words is "two hundred forty-three million, nine hundred nineteen thousand, nine hundred sixty-nine".