142247161 has 4 divisors (see below), whose sum is σ = 162568192. Its totient is φ = 121926132.

The previous prime is 142247153. The next prime is 142247197. The reversal of 142247161 is 161742241.

142247161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 161742241 = 10891 ⋅14851.

It is a cyclic number.

It is not a de Polignac number, because 142247161 - 2³ = 142247153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142247101) 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, 10160505 + ... + 10160518.

It is an arithmetic number, because the mean of its divisors is an integer number (40642048).

Almost surely, 2^142247161 is an apocalyptic number.

It is an amenable number.

142247161 is a deficient number, since it is larger than the sum of its proper divisors (20321031).

142247161 is an equidigital number, since it uses as much as digits as its factorization.

142247161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20321030.

The product of its digits is 2688, while the sum is 28.

The square root of 142247161 is about 11926.7414242114. The cubic root of 142247161 is about 522.0128603771.

The spelling of 142247161 in words is "one hundred forty-two million, two hundred forty-seven thousand, one hundred sixty-one".