1213231305 has 48 divisors (see below), whose sum is σ = 2297856960. Its totient is φ = 542974080.

The previous prime is 1213231289. The next prime is 1213231319. The reversal of 1213231305 is 5031323121.

It is not a de Polignac number, because 1213231305 - 2⁴ = 1213231289 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2115 + ... + 49304.

It is an arithmetic number, because the mean of its divisors is an integer number (47872020).

Almost surely, 2^1213231305 is an apocalyptic number.

1213231305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213231305 is a deficient number, since it is larger than the sum of its proper divisors (1084625655).

1213231305 is a wasteful number, since it uses less digits than its factorization.

1213231305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51462 (or 51451 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1213231305 is about 34831.4700378838. The cubic root of 1213231305 is about 1066.5499572285.

Adding to 1213231305 its reverse (5031323121), we get a palindrome (6244554426).

The spelling of 1213231305 in words is "one billion, two hundred thirteen million, two hundred thirty-one thousand, three hundred five".