11420043161 has 2 divisors, whose sum is σ = 11420043162. Its totient is φ = 11420043160.

The previous prime is 11420043149. The next prime is 11420043179. The reversal of 11420043161 is 16134002411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7364900761 + 4055142400 = 85819^2 + 63680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11420043161 is a prime.

It is not a weakly prime, because it can be changed into another prime (11420043121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5710021580 + 5710021581.

It is an arithmetic number, because the mean of its divisors is an integer number (5710021581).

Almost surely, 2^11420043161 is an apocalyptic number.

It is an amenable number.

11420043161 is a deficient number, since it is larger than the sum of its proper divisors (1).

11420043161 is an equidigital number, since it uses as much as digits as its factorization.

11420043161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 11420043161 its reverse (16134002411), we get a palindrome (27554045572).

The spelling of 11420043161 in words is "eleven billion, four hundred twenty million, forty-three thousand, one hundred sixty-one".