142855681 has 4 divisors (see below), whose sum is σ = 143044164. Its totient is φ = 142667200.

The previous prime is 142855679. The next prime is 142855693. The reversal of 142855681 is 186558241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186558241 = 41 ⋅4550201.

It can be written as a sum of positive squares in 2 ways, for example, as 7924225 + 134931456 = 2815^2 + 11616^2 .

It is a cyclic number.

It is not a de Polignac number, because 142855681 - 2¹ = 142855679 is a prime.

It is a super-2 number, since 2×142855681² = 40815491187947522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142859681) 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, 93100 + ... + 94621.

It is an arithmetic number, because the mean of its divisors is an integer number (35761041).

Almost surely, 2^142855681 is an apocalyptic number.

It is an amenable number.

142855681 is a deficient number, since it is larger than the sum of its proper divisors (188483).

142855681 is an equidigital number, since it uses as much as digits as its factorization.

142855681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188482.

The product of its digits is 76800, while the sum is 40.

The square root of 142855681 is about 11952.2249393157. The cubic root of 142855681 is about 522.7561754412.

The spelling of 142855681 in words is "one hundred forty-two million, eight hundred fifty-five thousand, six hundred eighty-one".