142881649 has 2 divisors, whose sum is σ = 142881650. Its totient is φ = 142881648.

The previous prime is 142881643. The next prime is 142881667. The reversal of 142881649 is 946188241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78641424 + 64240225 = 8868^2 + 8015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142881649 is a prime.

It is not a weakly prime, because it can be changed into another prime (142881643) 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 as a sum of consecutive naturals, namely, 71440824 + 71440825.

It is an arithmetic number, because the mean of its divisors is an integer number (71440825).

Almost surely, 2^142881649 is an apocalyptic number.

It is an amenable number.

142881649 is a deficient number, since it is larger than the sum of its proper divisors (1).

142881649 is an equidigital number, since it uses as much as digits as its factorization.

142881649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 43.

The square root of 142881649 is about 11953.3112148894. The cubic root of 142881649 is about 522.7878486885.

The spelling of 142881649 in words is "one hundred forty-two million, eight hundred eighty-one thousand, six hundred forty-nine".