142545521 has 8 divisors (see below), whose sum is σ = 143617320. Its totient is φ = 141478272.

The previous prime is 142545449. The next prime is 142545523. The reversal of 142545521 is 125545241.

142545521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 11122225 + 131423296 = 3335^2 + 11464^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 142545521 - 2¹⁰ = 142544497 is a prime.

It is a super-2 number, since 2×142545521² = 40638451114322882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (142545523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83351 + ... + 85043.

It is an arithmetic number, because the mean of its divisors is an integer number (17952165).

Almost surely, 2^142545521 is an apocalyptic number.

It is an amenable number.

142545521 is a deficient number, since it is larger than the sum of its proper divisors (1071799).

142545521 is a wasteful number, since it uses less digits than its factorization.

142545521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2275.

The product of its digits is 8000, while the sum is 29.

The square root of 142545521 is about 11939.2428989446. The cubic root of 142545521 is about 522.3775753100.

The spelling of 142545521 in words is "one hundred forty-two million, five hundred forty-five thousand, five hundred twenty-one".