243775542061 has 2 divisors, whose sum is σ = 243775542062. Its totient is φ = 243775542060.

The previous prime is 243775541983. The next prime is 243775542071. The reversal of 243775542061 is 160245577342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239726765161 + 4048776900 = 489619^2 + 63630^2 .

It is a cyclic number.

It is not a de Polignac number, because 243775542061 - 2¹¹ = 243775540013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243775542071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121887771030 + 121887771031.

It is an arithmetic number, because the mean of its divisors is an integer number (121887771031).

Almost surely, 2^243775542061 is an apocalyptic number.

It is an amenable number.

243775542061 is a deficient number, since it is larger than the sum of its proper divisors (1).

243775542061 is an equidigital number, since it uses as much as digits as its factorization.

243775542061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1411200, while the sum is 46.

The spelling of 243775542061 in words is "two hundred forty-three billion, seven hundred seventy-five million, five hundred forty-two thousand, sixty-one".