142306561 has 6 divisors (see below), whose sum is σ = 150190962. Its totient is φ = 134816400.

The previous prime is 142306559. The next prime is 142306597. The reversal of 142306561 is 165603241.

It can be written as a sum of positive squares in only one way, i.e., 138768400 + 3538161 = 11780^2 + 1881^2 .

It is not a de Polignac number, because 142306561 - 2¹ = 142306559 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 (142306501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 196740 + ... + 197461.

It is an arithmetic number, because the mean of its divisors is an integer number (25031827).

Almost surely, 2^142306561 is an apocalyptic number.

It is an amenable number.

142306561 is a deficient number, since it is larger than the sum of its proper divisors (7884401).

142306561 is an equidigital number, since it uses as much as digits as its factorization.

142306561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394239 (or 394220 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 142306561 is about 11929.2313666891. The cubic root of 142306561 is about 522.0855115021.

The spelling of 142306561 in words is "one hundred forty-two million, three hundred six thousand, five hundred sixty-one".