1321308500 has 48 divisors (see below), whose sum is σ = 2893053072. Its totient is φ = 527184000.

The previous prime is 1321308491. The next prime is 1321308523. The reversal of 1321308500 is 58031231.

It can be written as a sum of positive squares in 8 ways, for example, as 479960464 + 841348036 = 21908^2 + 29006^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207362 + ... + 213638.

It is an arithmetic number, because the mean of its divisors is an integer number (60271939).

Almost surely, 2^1321308500 is an apocalyptic number.

1321308500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321308500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1446526536).

1321308500 is an abundant number, since it is smaller than the sum of its proper divisors (1571744572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321308500 is a wasteful number, since it uses less digits than its factorization.

1321308500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6717 (or 6705 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1321308500 is about 36349.8074272753. The cubic root of 1321308500 is about 1097.3236589325.

Adding to 1321308500 its reverse (58031231), we get a palindrome (1379339731).

The spelling of 1321308500 in words is "one billion, three hundred twenty-one million, three hundred eight thousand, five hundred".