142547561 has 8 divisors (see below), whose sum is σ = 153673800. Its totient is φ = 131444352.

The previous prime is 142547551. The next prime is 142547563. The reversal of 142547561 is 165745241.

It can be written as a sum of positive squares in 4 ways, for example, as 67551961 + 74995600 = 8219^2 + 8660^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-142547561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142547563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8411 + ... + 18863.

It is an arithmetic number, because the mean of its divisors is an integer number (19209225).

Almost surely, 2^142547561 is an apocalyptic number.

It is an amenable number.

142547561 is a deficient number, since it is larger than the sum of its proper divisors (11126239).

142547561 is a wasteful number, since it uses less digits than its factorization.

142547561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11515.

The product of its digits is 33600, while the sum is 35.

The square root of 142547561 is about 11939.3283311918. The cubic root of 142547561 is about 522.3800672512.

The spelling of 142547561 in words is "one hundred forty-two million, five hundred forty-seven thousand, five hundred sixty-one".