243573601 has 2 divisors, whose sum is σ = 243573602. Its totient is φ = 243573600.

The previous prime is 243573593. The next prime is 243573613. The reversal of 243573601 is 106375342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132250000 + 111323601 = 11500^2 + 10551^2 .

It is a cyclic number.

It is not a de Polignac number, because 243573601 - 2³ = 243573593 is a prime.

It is not a weakly prime, because it can be changed into another prime (243573641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121786800 + 121786801.

It is an arithmetic number, because the mean of its divisors is an integer number (121786801).

Almost surely, 2^243573601 is an apocalyptic number.

It is an amenable number.

243573601 is a deficient number, since it is larger than the sum of its proper divisors (1).

243573601 is an equidigital number, since it uses as much as digits as its factorization.

243573601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 243573601 is about 15606.8446843044. The cubic root of 243573601 is about 624.5157644424.

The spelling of 243573601 in words is "two hundred forty-three million, five hundred seventy-three thousand, six hundred one".