142538417309 has 4 divisors (see below), whose sum is σ = 146390807004. Its totient is φ = 138686027616.

The previous prime is 142538417303. The next prime is 142538417321. The reversal of 142538417309 is 903714835241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903714835241 = 67 ⋅13488281123.

It can be written as a sum of positive squares in 2 ways, for example, as 137073955225 + 5464462084 = 370235^2 + 73922^2 .

It is a cyclic number.

It is not a de Polignac number, because 142538417309 - 2²⁰ = 142537368733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142538417303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1926194792 + ... + 1926194865.

It is an arithmetic number, because the mean of its divisors is an integer number (36597701751).

Almost surely, 2^142538417309 is an apocalyptic number.

It is an amenable number.

142538417309 is a deficient number, since it is larger than the sum of its proper divisors (3852389695).

142538417309 is an equidigital number, since it uses as much as digits as its factorization.

142538417309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3852389694.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 142538417309 in words is "one hundred forty-two billion, five hundred thirty-eight million, four hundred seventeen thousand, three hundred nine".