1144431021 has 4 divisors (see below), whose sum is σ = 1525908032. Its totient is φ = 762954012.

The previous prime is 1144431017. The next prime is 1144431077. The reversal of 1144431021 is 1201344411.

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: 1201344411 = 3 ⋅400448137.

It is not a de Polignac number, because 1144431021 - 2² = 1144431017 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 (1144431091) 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, 190738501 + ... + 190738506.

It is an arithmetic number, because the mean of its divisors is an integer number (381477008).

Almost surely, 2^1144431021 is an apocalyptic number.

It is an amenable number.

1144431021 is a deficient number, since it is larger than the sum of its proper divisors (381477011).

1144431021 is an equidigital number, since it uses as much as digits as its factorization.

1144431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381477010.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1144431021 is about 33829.4401520333. The cubic root of 1144431021 is about 1045.9956387745.

Adding to 1144431021 its reverse (1201344411), we get a palindrome (2345775432).

The spelling of 1144431021 in words is "one billion, one hundred forty-four million, four hundred thirty-one thousand, twenty-one".