1231020320 has 96 divisors (see below), whose sum is σ = 3110543856. Its totient is φ = 458752000.

The previous prime is 1231020311. The next prime is 1231020353. The reversal of 1231020320 is 230201321.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1147041424 + 83978896 = 33868^2 + 9164^2 .

It is a super-2 number, since 2×1231020320² = 3030822056505804800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231020295 and 1231020304.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272480 + ... + 276960.

Almost surely, 2^1231020320 is an apocalyptic number.

1231020320 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 1231020320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1555271928).

1231020320 is an abundant number, since it is smaller than the sum of its proper divisors (1879523536).

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

1231020320 is a wasteful number, since it uses less digits than its factorization.

1231020320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4614 (or 4606 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1231020320 is about 35085.8991619140. The cubic root of 1231020320 is about 1071.7374514826.

Adding to 1231020320 its reverse (230201321), we get a palindrome (1461221641).

The spelling of 1231020320 in words is "one billion, two hundred thirty-one million, twenty thousand, three hundred twenty".