1231220312 has 16 divisors (see below), whose sum is σ = 2638329360. Its totient is φ = 527665824.

The previous prime is 1231220303. The next prime is 1231220351. The reversal of 1231220312 is 2130221321.

It is a super-3 number, since 3×1231220312³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10992983 + ... + 10993094.

It is an arithmetic number, because the mean of its divisors is an integer number (164895585).

Almost surely, 2^1231220312 is an apocalyptic number.

It is an amenable number.

1231220312 is an abundant number, since it is smaller than the sum of its proper divisors (1407109048).

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

1231220312 is a wasteful number, since it uses less digits than its factorization.

1231220312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21986090 (or 21986086 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1231220312 is about 35088.7490800114. The cubic root of 1231220312 is about 1071.7954866227.

Adding to 1231220312 its reverse (2130221321), we get a palindrome (3361441633).

The spelling of 1231220312 in words is "one billion, two hundred thirty-one million, two hundred twenty thousand, three hundred twelve".