1231313430 has 64 divisors (see below), whose sum is σ = 3133267200. Its totient is φ = 308810880.

The previous prime is 1231313423. The next prime is 1231313443. The reversal of 1231313430 is 343131321.

It is a super-2 number, since 2×1231313430² = 3032265525796729800, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1231313397 and 1231313406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71460 + ... + 87000.

It is an arithmetic number, because the mean of its divisors is an integer number (48957300).

Almost surely, 2^1231313430 is an apocalyptic number.

1231313430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231313430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1566633600).

1231313430 is an abundant number, since it is smaller than the sum of its proper divisors (1901953770).

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

1231313430 is a wasteful number, since it uses less digits than its factorization.

1231313430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15709.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 1231313430 is about 35090.0759474812. The cubic root of 1231313430 is about 1071.8225061402.

Adding to 1231313430 its reverse (343131321), we get a palindrome (1574444751).

The spelling of 1231313430 in words is "one billion, two hundred thirty-one million, three hundred thirteen thousand, four hundred thirty".