243155929 has 2 divisors, whose sum is σ = 243155930. Its totient is φ = 243155928.

The previous prime is 243155903. The next prime is 243155959. The reversal of 243155929 is 929551342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141610000 + 101545929 = 11900^2 + 10077^2 .

It is a cyclic number.

It is not a de Polignac number, because 243155929 - 2⁹ = 243155417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243155891 and 243155900.

It is not a weakly prime, because it can be changed into another prime (243155959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121577964 + 121577965.

It is an arithmetic number, because the mean of its divisors is an integer number (121577965).

Almost surely, 2^243155929 is an apocalyptic number.

It is an amenable number.

243155929 is a deficient number, since it is larger than the sum of its proper divisors (1).

243155929 is an equidigital number, since it uses as much as digits as its factorization.

243155929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 40.

The square root of 243155929 is about 15593.4578910516. The cubic root of 243155929 is about 624.1585938454.

The spelling of 243155929 in words is "two hundred forty-three million, one hundred fifty-five thousand, nine hundred twenty-nine".