1231301311320 has 128 divisors (see below), whose sum is σ = 3719370493440. Its totient is φ = 326084505600.

The previous prime is 1231301311319. The next prime is 1231301311403. The reversal of 1231301311320 is 231131031321.

It is a happy number.

It is a super-2 number, since 2×1231301311320² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93365767 + ... + 93378953.

It is an arithmetic number, because the mean of its divisors is an integer number (29057581980).

Almost surely, 2^{1231301311320} is an apocalyptic number.

1231301311320 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 1231301311320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1859685246720).

1231301311320 is an abundant number, since it is smaller than the sum of its proper divisors (2488069182120).

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

1231301311320 is a wasteful number, since it uses less digits than its factorization.

1231301311320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18505 (or 18501 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 1231301311320 its reverse (231131031321), we get a palindrome (1462432342641).

The spelling of 1231301311320 in words is "one trillion, two hundred thirty-one billion, three hundred one million, three hundred eleven thousand, three hundred twenty".