1181433161 has 2 divisors, whose sum is σ = 1181433162. Its totient is φ = 1181433160.

The previous prime is 1181433137. The next prime is 1181433191. The reversal of 1181433161 is 1613341811.

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., 1126005136 + 55428025 = 33556^2 + 7445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1181433161 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1181433101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590716580 + 590716581.

It is an arithmetic number, because the mean of its divisors is an integer number (590716581).

Almost surely, 2^1181433161 is an apocalyptic number.

It is an amenable number.

1181433161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181433161 is an equidigital number, since it uses as much as digits as its factorization.

1181433161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 1181433161 is about 34371.9822093518. The cubic root of 1181433161 is about 1057.1494436118.

Adding to 1181433161 its reverse (1613341811), we get a palindrome (2794774972).

The spelling of 1181433161 in words is "one billion, one hundred eighty-one million, four hundred thirty-three thousand, one hundred sixty-one".