1133445661 has 2 divisors, whose sum is σ = 1133445662. Its totient is φ = 1133445660.

The previous prime is 1133445647. The next prime is 1133445671. The reversal of 1133445661 is 1665443311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1004509636 + 128936025 = 31694^2 + 11355^2 .

It is a cyclic number.

It is not a de Polignac number, because 1133445661 - 2⁵ = 1133445629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1133445601) 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, 566722830 + 566722831.

It is an arithmetic number, because the mean of its divisors is an integer number (566722831).

Almost surely, 2^1133445661 is an apocalyptic number.

It is an amenable number.

1133445661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1133445661 is an equidigital number, since it uses as much as digits as its factorization.

1133445661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

The square root of 1133445661 is about 33666.6847343186. The cubic root of 1133445661 is about 1042.6380453885.

Adding to 1133445661 its reverse (1665443311), we get a palindrome (2798888972).

The spelling of 1133445661 in words is "one billion, one hundred thirty-three million, four hundred forty-five thousand, six hundred sixty-one".