142567861 has 8 divisors (see below), whose sum is σ = 143434424. Its totient is φ = 141704640.

The previous prime is 142567837. The next prime is 142567877. The reversal of 142567861 is 168765241.

It can be written as a sum of positive squares in 4 ways, for example, as 3186225 + 139381636 = 1785^2 + 11806^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 142567861 - 2⁹ = 142567349 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 (142567891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166711 + ... + 167563.

It is an arithmetic number, because the mean of its divisors is an integer number (17929303).

Almost surely, 2^142567861 is an apocalyptic number.

It is an amenable number.

142567861 is a deficient number, since it is larger than the sum of its proper divisors (866563).

142567861 is an equidigital number, since it uses as much as digits as its factorization.

142567861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671.

The product of its digits is 80640, while the sum is 40.

The square root of 142567861 is about 11940.1784325026. The cubic root of 142567861 is about 522.4048632139.

The spelling of 142567861 in words is "one hundred forty-two million, five hundred sixty-seven thousand, eight hundred sixty-one".