1221744143 has 4 divisors (see below), whose sum is σ = 1222075680. Its totient is φ = 1221412608.

The previous prime is 1221744127. The next prime is 1221744163. The reversal of 1221744143 is 3414471221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221744143 - 2⁴ = 1221744127 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 (1221744113) 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, 160178 + ... + 167631.

It is an arithmetic number, because the mean of its divisors is an integer number (305518920).

Almost surely, 2^1221744143 is an apocalyptic number.

1221744143 is a deficient number, since it is larger than the sum of its proper divisors (331537).

1221744143 is an equidigital number, since it uses as much as digits as its factorization.

1221744143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331536.

The product of its digits is 5376, while the sum is 29.

The square root of 1221744143 is about 34953.4568104501. The cubic root of 1221744143 is about 1069.0386867712.

The spelling of 1221744143 in words is "one billion, two hundred twenty-one million, seven hundred forty-four thousand, one hundred forty-three".