142221649 has 4 divisors (see below), whose sum is σ = 142249636. Its totient is φ = 142193664.

The previous prime is 142221623. The next prime is 142221689. The reversal of 142221649 is 946122241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18122049 + 124099600 = 4257^2 + 11140^2 .

It is a cyclic number.

It is not a de Polignac number, because 142221649 - 2¹⁵ = 142188881 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142221649.

It is not an unprimeable number, because it can be changed into a prime (142221619) by changing a digit.

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, 3984 + ... + 17329.

It is an arithmetic number, because the mean of its divisors is an integer number (35562409).

Almost surely, 2^142221649 is an apocalyptic number.

It is an amenable number.

142221649 is a deficient number, since it is larger than the sum of its proper divisors (27987).

142221649 is an equidigital number, since it uses as much as digits as its factorization.

142221649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27986.

The product of its digits is 6912, while the sum is 31.

The square root of 142221649 is about 11925.6718469024. The cubic root of 142221649 is about 521.9816508771.

The spelling of 142221649 in words is "one hundred forty-two million, two hundred twenty-one thousand, six hundred forty-nine".