1178341561 has 2 divisors, whose sum is σ = 1178341562. Its totient is φ = 1178341560.

The previous prime is 1178341523. The next prime is 1178341583. The reversal of 1178341561 is 1651438711.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 945931536 + 232410025 = 30756^2 + 15245^2 .

It is a cyclic number.

It is not a de Polignac number, because 1178341561 - 2¹⁵ = 1178308793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1178341561.

It is not a weakly prime, because it can be changed into another prime (1178341511) 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, 589170780 + 589170781.

It is an arithmetic number, because the mean of its divisors is an integer number (589170781).

Almost surely, 2^1178341561 is an apocalyptic number.

It is an amenable number.

1178341561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1178341561 is an equidigital number, since it uses as much as digits as its factorization.

1178341561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The square root of 1178341561 is about 34326.9800739884. The cubic root of 1178341561 is about 1056.2265142077.

The spelling of 1178341561 in words is "one billion, one hundred seventy-eight million, three hundred forty-one thousand, five hundred sixty-one".