142188121 has 2 divisors, whose sum is σ = 142188122. Its totient is φ = 142188120.

The previous prime is 142188097. The next prime is 142188157. The reversal of 142188121 is 121881241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99102025 + 43086096 = 9955^2 + 6564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142188121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142188121.

It is not a weakly prime, because it can be changed into another prime (142182121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71094060 + 71094061.

It is an arithmetic number, because the mean of its divisors is an integer number (71094061).

Almost surely, 2^142188121 is an apocalyptic number.

It is an amenable number.

142188121 is a deficient number, since it is larger than the sum of its proper divisors (1).

142188121 is an equidigital number, since it uses as much as digits as its factorization.

142188121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1024, while the sum is 28.

The square root of 142188121 is about 11924.2660570787. The cubic root of 142188121 is about 521.9406295174.

The spelling of 142188121 in words is "one hundred forty-two million, one hundred eighty-eight thousand, one hundred twenty-one".