243158497 has 8 divisors (see below), whose sum is σ = 257599656. Its totient is φ = 228732672.

The previous prime is 243158473. The next prime is 243158501. The reversal of 243158497 is 794851342.

It can be written as a sum of positive squares in 4 ways, for example, as 146313216 + 96845281 = 12096^2 + 9841^2 .

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 243158497 - 2¹⁹ = 242634209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243158467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53103 + ... + 57499.

It is an arithmetic number, because the mean of its divisors is an integer number (32199957).

Almost surely, 2^243158497 is an apocalyptic number.

It is an amenable number.

243158497 is a deficient number, since it is larger than the sum of its proper divisors (14441159).

243158497 is a wasteful number, since it uses less digits than its factorization.

243158497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7667.

The product of its digits is 241920, while the sum is 43.

The square root of 243158497 is about 15593.5402330580. The cubic root of 243158497 is about 624.1607911098.

The spelling of 243158497 in words is "two hundred forty-three million, one hundred fifty-eight thousand, four hundred ninety-seven".