1312021232 has 20 divisors (see below), whose sum is σ = 2585128440. Its totient is φ = 644891328.

The previous prime is 1312021229. The next prime is 1312021241. The reversal of 1312021232 is 2321202131.

It is a self number, because there is not a number n which added to its sum of digits gives 1312021232.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693983 + ... + 695870.

It is an arithmetic number, because the mean of its divisors is an integer number (129256422).

Almost surely, 2^1312021232 is an apocalyptic number.

It is an amenable number.

1312021232 is a deficient number, since it is larger than the sum of its proper divisors (1273107208).

1312021232 is a wasteful number, since it uses less digits than its factorization.

1312021232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389920 (or 1389914 counting only the distinct ones).

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

The square root of 1312021232 is about 36221.8336366341. The cubic root of 1312021232 is about 1094.7466402976.

Adding to 1312021232 its reverse (2321202131), we get a palindrome (3633223363).

The spelling of 1312021232 in words is "one billion, three hundred twelve million, twenty-one thousand, two hundred thirty-two".