1321531504 has 20 divisors (see below), whose sum is σ = 2561160976. Its totient is φ = 660586752.

The previous prime is 1321531487. The next prime is 1321531507. The reversal of 1321531504 is 4051351231.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321531507) 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, 65752 + ... + 83464.

Almost surely, 2^1321531504 is an apocalyptic number.

It is an amenable number.

1321531504 is a deficient number, since it is larger than the sum of its proper divisors (1239629472).

1321531504 is a wasteful number, since it uses less digits than its factorization.

1321531504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22384 (or 22378 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1321531504 is about 36352.8747694044. The cubic root of 1321531504 is about 1097.3853891037.

Adding to 1321531504 its reverse (4051351231), we get a palindrome (5372882735).

The spelling of 1321531504 in words is "one billion, three hundred twenty-one million, five hundred thirty-one thousand, five hundred four".