142123109 has 2 divisors, whose sum is σ = 142123110. Its totient is φ = 142123108.

The previous prime is 142123103. The next prime is 142123199. The reversal of 142123109 is 901321241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128822500 + 13300609 = 11350^2 + 3647^2 .

It is a cyclic number.

It is not a de Polignac number, because 142123109 - 2¹² = 142119013 is a prime.

It is a super-2 number, since 2×142123109² = 40397956223651762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142123103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71061554 + 71061555.

It is an arithmetic number, because the mean of its divisors is an integer number (71061555).

Almost surely, 2^142123109 is an apocalyptic number.

It is an amenable number.

142123109 is a deficient number, since it is larger than the sum of its proper divisors (1).

142123109 is an equidigital number, since it uses as much as digits as its factorization.

142123109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 142123109 is about 11921.5397076049. The cubic root of 142123109 is about 521.8610692446.

The spelling of 142123109 in words is "one hundred forty-two million, one hundred twenty-three thousand, one hundred nine".