243131442977 has 2 divisors, whose sum is σ = 243131442978. Its totient is φ = 243131442976.

The previous prime is 243131442893. The next prime is 243131443031. The reversal of 243131442977 is 779244131342.

243131442977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177456617536 + 65674825441 = 421256^2 + 256271^2 .

It is a cyclic number.

It is not a de Polignac number, because 243131442977 - 2³⁰ = 242057701153 is a prime.

It is a super-2 number, since 2×243131442977² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243131442077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121565721488 + 121565721489.

It is an arithmetic number, because the mean of its divisors is an integer number (121565721489).

Almost surely, 2^243131442977 is an apocalyptic number.

It is an amenable number.

243131442977 is a deficient number, since it is larger than the sum of its proper divisors (1).

243131442977 is an equidigital number, since it uses as much as digits as its factorization.

243131442977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 47.

The spelling of 243131442977 in words is "two hundred forty-three billion, one hundred thirty-one million, four hundred forty-two thousand, nine hundred seventy-seven".