1144455421 has 4 divisors (see below), whose sum is σ = 1145021500. Its totient is φ = 1143889344.

The previous prime is 1144455397. The next prime is 1144455457. The reversal of 1144455421 is 1245544411.

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 784784196 + 359671225 = 28014^2 + 18965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1144455421 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 (1144455491) 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, 279996 + ... + 284053.

It is an arithmetic number, because the mean of its divisors is an integer number (286255375).

Almost surely, 2^1144455421 is an apocalyptic number.

It is an amenable number.

1144455421 is a deficient number, since it is larger than the sum of its proper divisors (566079).

1144455421 is an equidigital number, since it uses as much as digits as its factorization.

1144455421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566078.

The product of its digits is 12800, while the sum is 31.

The square root of 1144455421 is about 33829.8007827418. The cubic root of 1144455421 is about 1046.0030724866.

Adding to 1144455421 its reverse (1245544411), we get a palindrome (2389999832).

The spelling of 1144455421 in words is "one billion, one hundred forty-four million, four hundred fifty-five thousand, four hundred twenty-one".