243473749 has 2 divisors, whose sum is σ = 243473750. Its totient is φ = 243473748.

The previous prime is 243473723. The next prime is 243473773. The reversal of 243473749 is 947374342.

243473749 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., 171138724 + 72335025 = 13082^2 + 8505^2 .

It is a cyclic number.

It is not a de Polignac number, because 243473749 - 2¹⁷ = 243342677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243476749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121736874 + 121736875.

It is an arithmetic number, because the mean of its divisors is an integer number (121736875).

Almost surely, 2^243473749 is an apocalyptic number.

It is an amenable number.

243473749 is a deficient number, since it is larger than the sum of its proper divisors (1).

243473749 is an equidigital number, since it uses as much as digits as its factorization.

243473749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 43.

The square root of 243473749 is about 15603.6453753602. The cubic root of 243473749 is about 624.4304135517.

The spelling of 243473749 in words is "two hundred forty-three million, four hundred seventy-three thousand, seven hundred forty-nine".