142856681 has 4 divisors (see below), whose sum is σ = 155843664. Its totient is φ = 129869700.

The previous prime is 142856647. The next prime is 142856683. The reversal of 142856681 is 186658241.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142856681 is a prime.

It is a super-2 number, since 2×142856681² = 40816062612671522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142856683) 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 3 ways as a sum of consecutive naturals, for example, 6493475 + ... + 6493496.

It is an arithmetic number, because the mean of its divisors is an integer number (38960916).

Almost surely, 2^142856681 is an apocalyptic number.

142856681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142856681 is a deficient number, since it is larger than the sum of its proper divisors (12986983).

142856681 is a wasteful number, since it uses less digits than its factorization.

142856681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12986982.

The product of its digits is 92160, while the sum is 41.

The square root of 142856681 is about 11952.2667724579. The cubic root of 142856681 is about 522.7573952153.

The spelling of 142856681 in words is "one hundred forty-two million, eight hundred fifty-six thousand, six hundred eighty-one".