142122161 has 2 divisors, whose sum is σ = 142122162. Its totient is φ = 142122160.

The previous prime is 142122107. The next prime is 142122163. The reversal of 142122161 is 161221241.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123632161 + 18490000 = 11119^2 + 4300^2 .

It is an emirp because it is prime and its reverse (161221241) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142122161 is a prime.

Together with 142122163, 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 (142122163) 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, 71061080 + 71061081.

It is an arithmetic number, because the mean of its divisors is an integer number (71061081).

Almost surely, 2^142122161 is an apocalyptic number.

It is an amenable number.

142122161 is a deficient number, since it is larger than the sum of its proper divisors (1).

142122161 is an equidigital number, since it uses as much as digits as its factorization.

142122161 is an odious number, because the sum of its binary digits is odd.

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

The square root of 142122161 is about 11921.4999475737. The cubic root of 142122161 is about 521.8599089233.

The spelling of 142122161 in words is "one hundred forty-two million, one hundred twenty-two thousand, one hundred sixty-one".