243112451261 has 2 divisors, whose sum is σ = 243112451262. Its totient is φ = 243112451260.

The previous prime is 243112451237. The next prime is 243112451321. The reversal of 243112451261 is 162154211342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140526767161 + 102585684100 = 374869^2 + 320290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243112451261 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243112451761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121556225630 + 121556225631.

It is an arithmetic number, because the mean of its divisors is an integer number (121556225631).

Almost surely, 2^243112451261 is an apocalyptic number.

It is an amenable number.

243112451261 is a deficient number, since it is larger than the sum of its proper divisors (1).

243112451261 is an equidigital number, since it uses as much as digits as its factorization.

243112451261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The spelling of 243112451261 in words is "two hundred forty-three billion, one hundred twelve million, four hundred fifty-one thousand, two hundred sixty-one".