1231245312 has 104 divisors (see below), whose sum is σ = 3581760480. Its totient is φ = 373063680.

The previous prime is 1231245311. The next prime is 1231245317. The reversal of 1231245312 is 2135421321.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231245311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130614 + ... + 139722.

Almost surely, 2^1231245312 is an apocalyptic number.

1231245312 is a gapful number since it is divisible by the number (12) 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 1231245312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1790880240).

1231245312 is an abundant number, since it is smaller than the sum of its proper divisors (2350515168).

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

1231245312 is an equidigital number, since it uses as much as digits as its factorization.

1231245312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9147 (or 9125 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 1231245312 is about 35089.1053177478. The cubic root of 1231245312 is about 1071.8027408635.

Adding to 1231245312 its reverse (2135421321), we get a palindrome (3366666633).

The spelling of 1231245312 in words is "one billion, two hundred thirty-one million, two hundred forty-five thousand, three hundred twelve".