1155340561 has 2 divisors, whose sum is σ = 1155340562. Its totient is φ = 1155340560.

The previous prime is 1155340547. The next prime is 1155340633. The reversal of 1155340561 is 1650435511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 825700225 + 329640336 = 28735^2 + 18156^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155340561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155343561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577670280 + 577670281.

It is an arithmetic number, because the mean of its divisors is an integer number (577670281).

Almost surely, 2^1155340561 is an apocalyptic number.

It is an amenable number.

1155340561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155340561 is an equidigital number, since it uses as much as digits as its factorization.

1155340561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 1155340561 is about 33990.3009842514. The cubic root of 1155340561 is about 1049.3088606677.

The spelling of 1155340561 in words is "one billion, one hundred fifty-five million, three hundred forty thousand, five hundred sixty-one".