1311303616 has 56 divisors (see below), whose sum is σ = 2982081920. Its totient is φ = 560431872.

The previous prime is 1311303607. The next prime is 1311303647. The reversal of 1311303616 is 6163031131.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165931 + ... + 173653.

Almost surely, 2^1311303616 is an apocalyptic number.

1311303616 is a gapful number since it is divisible by the number (16) 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 1311303616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1491040960).

1311303616 is an abundant number, since it is smaller than the sum of its proper divisors (1670778304).

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

1311303616 is an equidigital number, since it uses as much as digits as its factorization.

1311303616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8121 (or 8111 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 1311303616 is about 36211.9264331518. The cubic root of 1311303616 is about 1094.5470116737.

Adding to 1311303616 its reverse (6163031131), we get a palindrome (7474334747).

The spelling of 1311303616 in words is "one billion, three hundred eleven million, three hundred three thousand, six hundred sixteen".