142217545 has 4 divisors (see below), whose sum is σ = 170661060. Its totient is φ = 113774032.

The previous prime is 142217531. The next prime is 142217573. The reversal of 142217545 is 545712241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545712241 = 15619 ⋅34939.

It can be written as a sum of positive squares in 2 ways, for example, as 43731769 + 98485776 = 6613^2 + 9924^2 .

It is a cyclic number.

It is not a de Polignac number, because 142217545 - 2⁷ = 142217417 is a prime.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 14221750 + ... + 14221759.

It is an arithmetic number, because the mean of its divisors is an integer number (42665265).

Almost surely, 2^142217545 is an apocalyptic number.

It is an amenable number.

142217545 is a deficient number, since it is larger than the sum of its proper divisors (28443515).

142217545 is an equidigital number, since it uses as much as digits as its factorization.

142217545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28443514.

The product of its digits is 11200, while the sum is 31.

The square root of 142217545 is about 11925.4997798834. The cubic root of 142217545 is about 521.9766299975.

Adding to 142217545 its reverse (545712241), we get a palindrome (687929786).

The spelling of 142217545 in words is "one hundred forty-two million, two hundred seventeen thousand, five hundred forty-five".