142136521 has 2 divisors, whose sum is σ = 142136522. Its totient is φ = 142136520.

The previous prime is 142136483. The next prime is 142136557. The reversal of 142136521 is 125631241.

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., 129140496 + 12996025 = 11364^2 + 3605^2 .

It is a cyclic number.

It is not a de Polignac number, because 142136521 - 2⁹ = 142136009 is a prime.

It is not a weakly prime, because it can be changed into another prime (142133521) 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, 71068260 + 71068261.

It is an arithmetic number, because the mean of its divisors is an integer number (71068261).

Almost surely, 2^142136521 is an apocalyptic number.

It is an amenable number.

142136521 is a deficient number, since it is larger than the sum of its proper divisors (1).

142136521 is an equidigital number, since it uses as much as digits as its factorization.

142136521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 142136521 is about 11922.1022055676. The cubic root of 142136521 is about 521.8774845448.

Adding to 142136521 its reverse (125631241), we get a palindrome (267767762).

The spelling of 142136521 in words is "one hundred forty-two million, one hundred thirty-six thousand, five hundred twenty-one".