1243321331 has 16 divisors (see below), whose sum is σ = 1428538560. Its totient is φ = 1060024320.

The previous prime is 1243321301. The next prime is 1243321349. The reversal of 1243321331 is 1331233421.

It is a cyclic number.

It is not a de Polignac number, because 1243321331 - 2¹⁰ = 1243320307 is a prime.

It is a super-2 number, since 2×1243321331² = 3091695864239223122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1243321297 and 1243321306.

It is not an unprimeable number, because it can be changed into a prime (1243321301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2154515 + ... + 2155091.

It is an arithmetic number, because the mean of its divisors is an integer number (89283660).

Almost surely, 2^1243321331 is an apocalyptic number.

1243321331 is a deficient number, since it is larger than the sum of its proper divisors (185217229).

1243321331 is an equidigital number, since it uses as much as digits as its factorization.

1243321331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694.

The product of its digits is 1296, while the sum is 23.

The square root of 1243321331 is about 35260.7619174629. The cubic root of 1243321331 is about 1075.2954172055.

Adding to 1243321331 its reverse (1331233421), we get a palindrome (2574554752).

The spelling of 1243321331 in words is "one billion, two hundred forty-three million, three hundred twenty-one thousand, three hundred thirty-one".