1231813248 has 32 divisors (see below), whose sum is σ = 3272004960. Its totient is φ = 410604288.

The previous prime is 1231813243. The next prime is 1231813249. The reversal of 1231813248 is 8423181321.

It is a tau number, because it is divible by the number of its divisors (32).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1231813243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1603540 + ... + 1604307.

It is an arithmetic number, because the mean of its divisors is an integer number (102250155).

Almost surely, 2^1231813248 is an apocalyptic number.

It is an amenable number.

1231813248 is an abundant number, since it is smaller than the sum of its proper divisors (2040191712).

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

1231813248 is an equidigital number, since it uses as much as digits as its factorization.

1231813248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3207864 (or 3207852 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 1231813248 is about 35097.1971530491. The cubic root of 1231813248 is about 1071.9675121958.

Adding to 1231813248 its reverse (8423181321), we get a palindrome (9654994569).

The spelling of 1231813248 in words is "one billion, two hundred thirty-one million, eight hundred thirteen thousand, two hundred forty-eight".