142106681 has 4 divisors (see below), whose sum is σ = 149586000. Its totient is φ = 134627364.

The previous prime is 142106669. The next prime is 142106687. The reversal of 142106681 is 186601241.

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, and also an emirpimes, since its reverse is a distinct semiprime: 186601241 = 941 ⋅198301.

It is a cyclic number.

It is not a de Polignac number, because 142106681 - 2¹⁸ = 141844537 is a prime.

It is a super-2 number, since 2×142106681² = 40388617569671522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142106687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3739631 + ... + 3739668.

It is an arithmetic number, because the mean of its divisors is an integer number (37396500).

Almost surely, 2^142106681 is an apocalyptic number.

It is an amenable number.

142106681 is a deficient number, since it is larger than the sum of its proper divisors (7479319).

142106681 is an equidigital number, since it uses as much as digits as its factorization.

142106681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7479318.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 142106681 is about 11920.8506827323. The cubic root of 142106681 is about 521.8409611753.

The spelling of 142106681 in words is "one hundred forty-two million, one hundred six thousand, six hundred eighty-one".