1228001143 has 4 divisors (see below), whose sum is σ = 1270346040. Its totient is φ = 1185656248.

The previous prime is 1228001129. The next prime is 1228001153. The reversal of 1228001143 is 3411008221.

It is a happy number.

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 1228001143 - 2⁵ = 1228001111 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 (1228001113) 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, 21172405 + ... + 21172462.

It is an arithmetic number, because the mean of its divisors is an integer number (317586510).

Almost surely, 2^1228001143 is an apocalyptic number.

1228001143 is a deficient number, since it is larger than the sum of its proper divisors (42344897).

1228001143 is an equidigital number, since it uses as much as digits as its factorization.

1228001143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42344896.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1228001143 is about 35042.8472444806. The cubic root of 1228001143 is about 1070.8605599191.

Adding to 1228001143 its reverse (3411008221), we get a palindrome (4639009364).

The spelling of 1228001143 in words is "one billion, two hundred twenty-eight million, one thousand, one hundred forty-three".