243091616 has 12 divisors (see below), whose sum is σ = 478586682. Its totient is φ = 121545792.

The previous prime is 243091609. The next prime is 243091627. The reversal of 243091616 is 616190342.

It can be written as a sum of positive squares in only one way, i.e., 242736400 + 355216 = 15580^2 + 596^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 7596613 = 243091616 / (2 + 4 + 3 + 0 + 9 + 1 + 6 + 1 + 6).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3798275 + ... + 3798338.

Almost surely, 2^243091616 is an apocalyptic number.

It is an amenable number.

243091616 is a deficient number, since it is larger than the sum of its proper divisors (235495066).

243091616 is an equidigital number, since it uses as much as digits as its factorization.

243091616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7596623 (or 7596615 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 243091616 is about 15591.3955757655. The cubic root of 243091616 is about 624.1035605020.

The spelling of 243091616 in words is "two hundred forty-three million, ninety-one thousand, six hundred sixteen".