243031979 has 2 divisors, whose sum is σ = 243031980. Its totient is φ = 243031978.

The previous prime is 243031913. The next prime is 243032047. The reversal of 243031979 is 979130342.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243031979 is a prime.

It is not a weakly prime, because it can be changed into another prime (243031079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121515989 + 121515990.

It is an arithmetic number, because the mean of its divisors is an integer number (121515990).

Almost surely, 2^243031979 is an apocalyptic number.

243031979 is a deficient number, since it is larger than the sum of its proper divisors (1).

243031979 is an equidigital number, since it uses as much as digits as its factorization.

243031979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 243031979 is about 15589.4829612787. The cubic root of 243031979 is about 624.0525197892.

The spelling of 243031979 in words is "two hundred forty-three million, thirty-one thousand, nine hundred seventy-nine".