1136378561 has 2 divisors, whose sum is σ = 1136378562. Its totient is φ = 1136378560.

The previous prime is 1136378557. The next prime is 1136378597. The reversal of 1136378561 is 1658736311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 889888561 + 246490000 = 29831^2 + 15700^2 .

It is an emirp because it is prime and its reverse (1658736311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1136378561 - 2² = 1136378557 is a prime.

It is not a weakly prime, because it can be changed into another prime (1136378531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 568189280 + 568189281.

It is an arithmetic number, because the mean of its divisors is an integer number (568189281).

Almost surely, 2^1136378561 is an apocalyptic number.

It is an amenable number.

1136378561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1136378561 is an equidigital number, since it uses as much as digits as its factorization.

1136378561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 1136378561 is about 33710.2144905665. The cubic root of 1136378561 is about 1043.5365796635.

The spelling of 1136378561 in words is "one billion, one hundred thirty-six million, three hundred seventy-eight thousand, five hundred sixty-one".