243198143537 has 2 divisors, whose sum is σ = 243198143538. Its totient is φ = 243198143536.

The previous prime is 243198143509. The next prime is 243198143557. The reversal of 243198143537 is 735341891342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199437269056 + 43760874481 = 446584^2 + 209191^2 .

It is a cyclic number.

It is not a de Polignac number, because 243198143537 - 2²⁰ = 243197094961 is a prime.

It is not a weakly prime, because it can be changed into another prime (243198143557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121599071768 + 121599071769.

It is an arithmetic number, because the mean of its divisors is an integer number (121599071769).

Almost surely, 2^243198143537 is an apocalyptic number.

It is an amenable number.

243198143537 is a deficient number, since it is larger than the sum of its proper divisors (1).

243198143537 is an equidigital number, since it uses as much as digits as its factorization.

243198143537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 50.

The spelling of 243198143537 in words is "two hundred forty-three billion, one hundred ninety-eight million, one hundred forty-three thousand, five hundred thirty-seven".