142118681 has 2 divisors, whose sum is σ = 142118682. Its totient is φ = 142118680.

The previous prime is 142118621. The next prime is 142118701. The reversal of 142118681 is 186811241.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79566400 + 62552281 = 8920^2 + 7909^2 .

It is a cyclic number.

It is not a de Polignac number, because 142118681 - 2⁶ = 142118617 is a prime.

It is a super-2 number, since 2×142118681² = 40395438978359522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (142118611) 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 as a sum of consecutive naturals, namely, 71059340 + 71059341.

It is an arithmetic number, because the mean of its divisors is an integer number (71059341).

Almost surely, 2^142118681 is an apocalyptic number.

It is an amenable number.

142118681 is a deficient number, since it is larger than the sum of its proper divisors (1).

142118681 is an equidigital number, since it uses as much as digits as its factorization.

142118681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 32.

The square root of 142118681 is about 11921.3539918920. The cubic root of 142118681 is about 521.8556494720.

It can be divided in two parts, 1421 and 18681, that added together give a palindrome (20102).

The spelling of 142118681 in words is "one hundred forty-two million, one hundred eighteen thousand, six hundred eighty-one".