142782521 has 6 divisors (see below), whose sum is σ = 166094010. Its totient is φ = 122384976.

The previous prime is 142782509. The next prime is 142782529. The reversal of 142782521 is 125287241.

It can be written as a sum of positive squares in only one way, i.e., 133079296 + 9703225 = 11536^2 + 3115^2 .

It is not a de Polignac number, because 142782521 - 2¹⁸ = 142520377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142782529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1456916 + ... + 1457013.

It is an arithmetic number, because the mean of its divisors is an integer number (27682335).

Almost surely, 2^142782521 is an apocalyptic number.

It is an amenable number.

142782521 is a deficient number, since it is larger than the sum of its proper divisors (23311489).

142782521 is an equidigital number, since it uses as much as digits as its factorization.

142782521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2913943 (or 2913936 counting only the distinct ones).

The product of its digits is 8960, while the sum is 32.

The square root of 142782521 is about 11949.1640293369. The cubic root of 142782521 is about 522.6669213257. Note that the first 3 decimals are identical.

The spelling of 142782521 in words is "one hundred forty-two million, seven hundred eighty-two thousand, five hundred twenty-one".