1042221161 has 2 divisors, whose sum is σ = 1042221162. Its totient is φ = 1042221160.

The previous prime is 1042221151. The next prime is 1042221163. The reversal of 1042221161 is 1611222401.

It is a happy number.

1042221161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 726625936 + 315595225 = 26956^2 + 17765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1042221161 is a prime.

Together with 1042221163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1042221163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521110580 + 521110581.

It is an arithmetic number, because the mean of its divisors is an integer number (521110581).

Almost surely, 2^1042221161 is an apocalyptic number.

It is an amenable number.

1042221161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1042221161 is an equidigital number, since it uses as much as digits as its factorization.

1042221161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1042221161 is about 32283.4502648029. The cubic root of 1042221161 is about 1013.8801698382.

Adding to 1042221161 its reverse (1611222401), we get a palindrome (2653443562).

The spelling of 1042221161 in words is "one billion, forty-two million, two hundred twenty-one thousand, one hundred sixty-one".