243592981 has 2 divisors, whose sum is σ = 243592982. Its totient is φ = 243592980.

The previous prime is 243592961. The next prime is 243592991. The reversal of 243592981 is 189295342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231800625 + 11792356 = 15225^2 + 3434^2 .

It is a cyclic number.

It is not a de Polignac number, because 243592981 - 2⁹ = 243592469 is a prime.

It is a super-2 number, since 2×243592981² = 118675080784932722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243592961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121796490 + 121796491.

It is an arithmetic number, because the mean of its divisors is an integer number (121796491).

Almost surely, 2^243592981 is an apocalyptic number.

It is an amenable number.

243592981 is a deficient number, since it is larger than the sum of its proper divisors (1).

243592981 is an equidigital number, since it uses as much as digits as its factorization.

243592981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 243592981 is about 15607.4655533818. The cubic root of 243592981 is about 624.5323272588.

The spelling of 243592981 in words is "two hundred forty-three million, five hundred ninety-two thousand, nine hundred eighty-one".