1178590561 has 2 divisors, whose sum is σ = 1178590562. Its totient is φ = 1178590560.

The previous prime is 1178590531. The next prime is 1178590597. The reversal of 1178590561 is 1650958711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 733380561 + 445210000 = 27081^2 + 21100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1178590561 - 2⁵ = 1178590529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1178590531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 589295280 + 589295281.

It is an arithmetic number, because the mean of its divisors is an integer number (589295281).

Almost surely, 2^1178590561 is an apocalyptic number.

It is an amenable number.

1178590561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1178590561 is an equidigital number, since it uses as much as digits as its factorization.

1178590561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 43.

The square root of 1178590561 is about 34330.6067671400. The cubic root of 1178590561 is about 1056.3009074305.

The spelling of 1178590561 in words is "one billion, one hundred seventy-eight million, five hundred ninety thousand, five hundred sixty-one".