243120137 has 8 divisors (see below), whose sum is σ = 270850440. Its totient is φ = 216679680.

The previous prime is 243120133. The next prime is 243120139. The reversal of 243120137 is 731021342.

It can be written as a sum of positive squares in 4 ways, for example, as 30514576 + 212605561 = 5524^2 + 14581^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243120137 - 2² = 243120133 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243120131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322064 + ... + 322817.

It is an arithmetic number, because the mean of its divisors is an integer number (33856305).

Almost surely, 2^243120137 is an apocalyptic number.

It is an amenable number.

243120137 is a deficient number, since it is larger than the sum of its proper divisors (27730303).

243120137 is a wasteful number, since it uses less digits than its factorization.

243120137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644923.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 243120137 is about 15592.3101880382. The cubic root of 243120137 is about 624.1279674339.

Adding to 243120137 its reverse (731021342), we get a palindrome (974141479).

The spelling of 243120137 in words is "two hundred forty-three million, one hundred twenty thousand, one hundred thirty-seven".