142545221 has 16 divisors (see below), whose sum is σ = 185762304. Its totient is φ = 106147584.

The previous prime is 142545217. The next prime is 142545241. The reversal of 142545221 is 122545241.

It is a cyclic number.

It is not a de Polignac number, because 142545221 - 2² = 142545217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142545241) 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 in 15 ways as a sum of consecutive naturals, for example, 44525 + ... + 47618.

It is an arithmetic number, because the mean of its divisors is an integer number (11610144).

Almost surely, 2^142545221 is an apocalyptic number.

It is an amenable number.

142545221 is a deficient number, since it is larger than the sum of its proper divisors (43217083).

142545221 is a wasteful number, since it uses less digits than its factorization.

142545221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92180.

The product of its digits is 3200, while the sum is 26.

The square root of 142545221 is about 11939.2303353273. The cubic root of 142545221 is about 522.3772088461.

The spelling of 142545221 in words is "one hundred forty-two million, five hundred forty-five thousand, two hundred twenty-one".