1321331231 has 32 divisors (see below), whose sum is σ = 1562803200. Its totient is φ = 1104192000.

The previous prime is 1321331191. The next prime is 1321331251.

1321331231 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321331231 is a prime.

It is a super-2 number, since 2×1321331231² = 3491832444031950722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321331251) 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 31 ways as a sum of consecutive naturals, for example, 2321915 + ... + 2322483.

It is an arithmetic number, because the mean of its divisors is an integer number (48837600).

Almost surely, 2^1321331231 is an apocalyptic number.

1321331231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1321331231 is a deficient number, since it is larger than the sum of its proper divisors (241471969).

1321331231 is a wasteful number, since it uses less digits than its factorization.

1321331231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911.

The product of its digits is 324, while the sum is 20.

The square root of 1321331231 is about 36350.1200960877. The cubic root of 1321331231 is about 1097.3299514628.

It can be divided in two parts, 13213 and 31231, that added together give a palindrome (44444).

The spelling of 1321331231 in words is "one billion, three hundred twenty-one million, three hundred thirty-one thousand, two hundred thirty-one".