243356749 has 2 divisors, whose sum is σ = 243356750. Its totient is φ = 243356748.

The previous prime is 243356723. The next prime is 243356759. The reversal of 243356749 is 947653342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174715524 + 68641225 = 13218^2 + 8285^2 .

It is a cyclic number.

It is not a de Polignac number, because 243356749 - 2¹⁷ = 243225677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243356759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121678374 + 121678375.

It is an arithmetic number, because the mean of its divisors is an integer number (121678375).

Almost surely, 2^243356749 is an apocalyptic number.

It is an amenable number.

243356749 is a deficient number, since it is larger than the sum of its proper divisors (1).

243356749 is an equidigital number, since it uses as much as digits as its factorization.

243356749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 43.

The square root of 243356749 is about 15599.8958009341. The cubic root of 243356749 is about 624.3303753006.

The spelling of 243356749 in words is "two hundred forty-three million, three hundred fifty-six thousand, seven hundred forty-nine".