1145431321 has 16 divisors (see below), whose sum is σ = 1281484800. Its totient is φ = 1017439488.

The previous prime is 1145431319. The next prime is 1145431327. The reversal of 1145431321 is 1231345411.

It is a cyclic number.

It is not a de Polignac number, because 1145431321 - 2¹ = 1145431319 is a prime.

It is a super-2 number, since 2×1145431321² = 2624025822255610082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1145431327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80296 + ... + 93478.

It is an arithmetic number, because the mean of its divisors is an integer number (80092800).

Almost surely, 2^1145431321 is an apocalyptic number.

It is an amenable number.

1145431321 is a deficient number, since it is larger than the sum of its proper divisors (136053479).

1145431321 is a wasteful number, since it uses less digits than its factorization.

1145431321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13488.

The product of its digits is 1440, while the sum is 25.

The square root of 1145431321 is about 33844.2213826822. The cubic root of 1145431321 is about 1046.3003039228.

Adding to 1145431321 its reverse (1231345411), we get a palindrome (2376776732).

The spelling of 1145431321 in words is "one billion, one hundred forty-five million, four hundred thirty-one thousand, three hundred twenty-one".