243603081 has 24 divisors (see below), whose sum is σ = 373618440. Its totient is φ = 152418816.

The previous prime is 243603077. The next prime is 243603109. The reversal of 243603081 is 180306342.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 29975625 + 213627456 = 5475^2 + 14616^2 .

It is not a de Polignac number, because 243603081 - 2² = 243603077 is a prime.

It is a super-2 number, since 2×243603081² = 118684922145385122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243603881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57471 + ... + 61563.

It is an arithmetic number, because the mean of its divisors is an integer number (15567435).

Almost surely, 2^243603081 is an apocalyptic number.

It is an amenable number.

243603081 is a deficient number, since it is larger than the sum of its proper divisors (130015359).

243603081 is a wasteful number, since it uses less digits than its factorization.

243603081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4505 (or 4502 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 243603081 is about 15607.7891131319. The cubic root of 243603081 is about 624.5409587190.

The spelling of 243603081 in words is "two hundred forty-three million, six hundred three thousand, eighty-one".