1161120281 has 4 divisors (see below), whose sum is σ = 1229421492. Its totient is φ = 1092819072.

The previous prime is 1161120269. The next prime is 1161120391. The reversal of 1161120281 is 1820211611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1820211611 = 233 ⋅7812067.

It can be written as a sum of positive squares in 2 ways, for example, as 724686400 + 436433881 = 26920^2 + 20891^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161120281 - 2⁶ = 1161120217 is a prime.

It is a super-2 number, since 2×1161120281² = 2696400613899037922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161120481) 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 in 3 ways as a sum of consecutive naturals, for example, 34150580 + ... + 34150613.

It is an arithmetic number, because the mean of its divisors is an integer number (307355373).

Almost surely, 2^1161120281 is an apocalyptic number.

It is an amenable number.

1161120281 is a deficient number, since it is larger than the sum of its proper divisors (68301211).

1161120281 is an equidigital number, since it uses as much as digits as its factorization.

1161120281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68301210.

The product of its (nonzero) digits is 192, while the sum is 23.

The square root of 1161120281 is about 34075.2150543471. The cubic root of 1161120281 is about 1051.0557124890.

Adding to 1161120281 its reverse (1820211611), we get a palindrome (2981331892).

The spelling of 1161120281 in words is "one billion, one hundred sixty-one million, one hundred twenty thousand, two hundred eighty-one".