142145521 has 6 divisors (see below), whose sum is σ = 165353010. Its totient is φ = 121838976.

The previous prime is 142145513. The next prime is 142145533. The reversal of 142145521 is 125541241.

It can be written as a sum of positive squares in only one way, i.e., 98109025 + 44036496 = 9905^2 + 6636^2 .

It is not a de Polignac number, because 142145521 - 2³ = 142145513 is a prime.

It is a super-2 number, since 2×142145521² = 40410698280722882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142145561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1450416 + ... + 1450513.

It is an arithmetic number, because the mean of its divisors is an integer number (27558835).

Almost surely, 2^142145521 is an apocalyptic number.

It is an amenable number.

142145521 is a deficient number, since it is larger than the sum of its proper divisors (23207489).

142145521 is an equidigital number, since it uses as much as digits as its factorization.

142145521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2900943 (or 2900936 counting only the distinct ones).

The product of its digits is 1600, while the sum is 25.

The square root of 142145521 is about 11922.4796498044. The cubic root of 142145521 is about 521.8884993030. Note that the first 3 decimals are identical.

Adding to 142145521 its reverse (125541241), we get a palindrome (267686762).

The spelling of 142145521 in words is "one hundred forty-two million, one hundred forty-five thousand, five hundred twenty-one".