1303321231 has 4 divisors (see below), whose sum is σ = 1303395912. Its totient is φ = 1303246552.

The previous prime is 1303321171. The next prime is 1303321237. The reversal of 1303321231 is 1321233031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1321233031 = 193 ⋅6845767.

It is a cyclic number.

It is not a de Polignac number, because 1303321231 - 2¹⁵ = 1303288463 is a prime.

It is a super-2 number, since 2×1303321231² = 3397292462350710722, 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 = 1303321199 and 1303321208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1303321237) 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, 4365 + ... + 51241.

It is an arithmetic number, because the mean of its divisors is an integer number (325848978).

Almost surely, 2^1303321231 is an apocalyptic number.

1303321231 is a deficient number, since it is larger than the sum of its proper divisors (74681).

1303321231 is an equidigital number, since it uses as much as digits as its factorization.

1303321231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74680.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1303321231 is about 36101.5405626962. The cubic root of 1303321231 is about 1092.3215203448.

Adding to 1303321231 its reverse (1321233031), we get a palindrome (2624554262).

The spelling of 1303321231 in words is "one billion, three hundred three million, three hundred twenty-one thousand, two hundred thirty-one".