1315321320 has 128 divisors (see below), whose sum is σ = 4160471040. Its totient is φ = 332171520.

The previous prime is 1315321313. The next prime is 1315321327. The reversal of 1315321320 is 231235131.

It is an interprime number because it is at equal distance from previous prime (1315321313) and next prime (1315321327).

It is not an unprimeable number, because it can be changed into a prime (1315321327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 171079 + ... + 178601.

It is an arithmetic number, because the mean of its divisors is an integer number (32503680).

Almost surely, 2^1315321320 is an apocalyptic number.

1315321320 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 1315321320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2080235520).

1315321320 is an abundant number, since it is smaller than the sum of its proper divisors (2845149720).

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

1315321320 is a wasteful number, since it uses less digits than its factorization.

1315321320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7615 (or 7611 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1315321320 is about 36267.3588781979. The cubic root of 1315321320 is about 1095.6637330410.

Adding to 1315321320 its reverse (231235131), we get a palindrome (1546556451).

The spelling of 1315321320 in words is "one billion, three hundred fifteen million, three hundred twenty-one thousand, three hundred twenty".