143693221 has 4 divisors (see below), whose sum is σ = 164220832. Its totient is φ = 123165612.

The previous prime is 143693203. The next prime is 143693227. The reversal of 143693221 is 122396341.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122396341 = 2027 ⋅60383.

It is a cyclic number.

It is not a de Polignac number, because 143693221 - 2¹⁵ = 143660453 is a prime.

It is a super-2 number, since 2×143693221² = 41295483522709682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143693227) 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, 10263795 + ... + 10263808.

It is an arithmetic number, because the mean of its divisors is an integer number (41055208).

Almost surely, 2^143693221 is an apocalyptic number.

It is an amenable number.

143693221 is a deficient number, since it is larger than the sum of its proper divisors (20527611).

143693221 is an equidigital number, since it uses as much as digits as its factorization.

143693221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20527610.

The product of its digits is 7776, while the sum is 31.

The square root of 143693221 is about 11987.2107264367. The cubic root of 143693221 is about 523.7757973406.

The spelling of 143693221 in words is "one hundred forty-three million, six hundred ninety-three thousand, two hundred twenty-one".