1320544431 has 16 divisors (see below), whose sum is σ = 1989523200. Its totient is φ = 865440504.

The previous prime is 1320544369. The next prime is 1320544439. The reversal of 1320544431 is 1344450231.

It is a happy number.

1320544431 is a `hidden beast` number, since 13 + 205 + 4 + 443 + 1 = 666.

It is not a de Polignac number, because 1320544431 - 2⁶ = 1320544367 is a prime.

It is a super-2 number, since 2×1320544431² = 3487675188490227522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1320544395 and 1320544404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320544439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 412891 + ... + 416076.

It is an arithmetic number, because the mean of its divisors is an integer number (124345200).

Almost surely, 2^1320544431 is an apocalyptic number.

1320544431 is a deficient number, since it is larger than the sum of its proper divisors (668978769).

1320544431 is an equidigital number, since it uses as much as digits as its factorization.

1320544431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829035 (or 829029 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 1320544431 is about 36339.2959618097. The cubic root of 1320544431 is about 1097.1121028236.

Adding to 1320544431 its reverse (1344450231), we get a palindrome (2664994662).

The spelling of 1320544431 in words is "one billion, three hundred twenty million, five hundred forty-four thousand, four hundred thirty-one".