143224621 has 4 divisors (see below), whose sum is σ = 143565244. Its totient is φ = 142884000.

The previous prime is 143224579. The next prime is 143224633. The reversal of 143224621 is 126422341.

It is a happy number.

143224621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 7502121 + 135722500 = 2739^2 + 11650^2 .

It is a 6-Lehmer number, since φ(143224621) divides (143224621-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 143224621 - 2¹³ = 143216429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143224021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169680 + ... + 170521.

It is an arithmetic number, because the mean of its divisors is an integer number (35891311).

Almost surely, 2^143224621 is an apocalyptic number.

It is an amenable number.

143224621 is a deficient number, since it is larger than the sum of its proper divisors (340623).

143224621 is an equidigital number, since it uses as much as digits as its factorization.

143224621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340622.

The product of its digits is 2304, while the sum is 25.

The square root of 143224621 is about 11967.6489336879. The cubic root of 143224621 is about 523.2058130704.

Adding to 143224621 its reverse (126422341), we get a palindrome (269646962).

The spelling of 143224621 in words is "one hundred forty-three million, two hundred twenty-four thousand, six hundred twenty-one".