142642609 has 4 divisors (see below), whose sum is σ = 143239680. Its totient is φ = 142045540.

The previous prime is 142642607. The next prime is 142642627. The reversal of 142642609 is 906246241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 906246241 = 557 ⋅1627013.

It is a cyclic number.

It is not a de Polignac number, because 142642609 - 2¹ = 142642607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142642607) 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, 298177 + ... + 298654.

It is an arithmetic number, because the mean of its divisors is an integer number (35809920).

Almost surely, 2^142642609 is an apocalyptic number.

It is an amenable number.

142642609 is a deficient number, since it is larger than the sum of its proper divisors (597071).

142642609 is an equidigital number, since it uses as much as digits as its factorization.

142642609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597070.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 142642609 is about 11943.3081263107. The cubic root of 142642609 is about 522.4961458168.

The spelling of 142642609 in words is "one hundred forty-two million, six hundred forty-two thousand, six hundred nine".