142145561 has 2 divisors, whose sum is σ = 142145562. Its totient is φ = 142145560.

The previous prime is 142145533. The next prime is 142145599. The reversal of 142145561 is 165541241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140659600 + 1485961 = 11860^2 + 1219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142145561 is a prime.

It is not a weakly prime, because it can be changed into another prime (142145461) 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, 71072780 + 71072781.

It is an arithmetic number, because the mean of its divisors is an integer number (71072781).

Almost surely, 2^142145561 is an apocalyptic number.

It is an amenable number.

142145561 is a deficient number, since it is larger than the sum of its proper divisors (1).

142145561 is an equidigital number, since it uses as much as digits as its factorization.

142145561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

The square root of 142145561 is about 11922.4813273077. The cubic root of 142145561 is about 521.8885482564. Note that the first 3 decimals are identical.

The spelling of 142145561 in words is "one hundred forty-two million, one hundred forty-five thousand, five hundred sixty-one".