142709123509 has 2 divisors, whose sum is σ = 142709123510. Its totient is φ = 142709123508.

The previous prime is 142709123419. The next prime is 142709123549. The reversal of 142709123509 is 905321907241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138010021009 + 4699102500 = 371497^2 + 68550^2 .

It is a cyclic number.

It is not a de Polignac number, because 142709123509 - 2³⁵ = 108349385141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142709123549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71354561754 + 71354561755.

It is an arithmetic number, because the mean of its divisors is an integer number (71354561755).

Almost surely, 2^142709123509 is an apocalyptic number.

It is an amenable number.

142709123509 is a deficient number, since it is larger than the sum of its proper divisors (1).

142709123509 is an equidigital number, since it uses as much as digits as its factorization.

142709123509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 142709123509 in words is "one hundred forty-two billion, seven hundred nine million, one hundred twenty-three thousand, five hundred nine".