1155665243 has 2 divisors, whose sum is σ = 1155665244. Its totient is φ = 1155665242.

The previous prime is 1155665239. The next prime is 1155665249. The reversal of 1155665243 is 3425665511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1155665243 - 2² = 1155665239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1155665197 and 1155665206.

It is not a weakly prime, because it can be changed into another prime (1155665249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577832621 + 577832622.

It is an arithmetic number, because the mean of its divisors is an integer number (577832622).

Almost surely, 2^1155665243 is an apocalyptic number.

1155665243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155665243 is an equidigital number, since it uses as much as digits as its factorization.

1155665243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108000, while the sum is 38.

The square root of 1155665243 is about 33995.0767464937. The cubic root of 1155665243 is about 1049.4071462011.

The spelling of 1155665243 in words is "one billion, one hundred fifty-five million, six hundred sixty-five thousand, two hundred forty-three".