243099945 has 96 divisors (see below), whose sum is σ = 477719424. Its totient is φ = 113356800.

The previous prime is 243099937. The next prime is 243099979. The reversal of 243099945 is 549990342.

It is a happy number.

It is not a de Polignac number, because 243099945 - 2³ = 243099937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 243099945.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2506137 + ... + 2506233.

It is an arithmetic number, because the mean of its divisors is an integer number (4976244).

Almost surely, 2^243099945 is an apocalyptic number.

It is an amenable number.

243099945 is a deficient number, since it is larger than the sum of its proper divisors (234619479).

243099945 is a wasteful number, since it uses less digits than its factorization.

243099945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 243099945 is about 15591.6626759304. The cubic root of 243099945 is about 624.1106882663.

The spelling of 243099945 in words is "two hundred forty-three million, ninety-nine thousand, nine hundred forty-five".