1201321312 has 24 divisors (see below), whose sum is σ = 2403877392. Its totient is φ = 590812800.

The previous prime is 1201321273. The next prime is 1201321327. The reversal of 1201321312 is 2131231021.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 305764 + ... + 309667.

It is an arithmetic number, because the mean of its divisors is an integer number (100161558).

Almost surely, 2^1201321312 is an apocalyptic number.

It is an amenable number.

1201321312 is an abundant number, since it is smaller than the sum of its proper divisors (1202556080).

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

1201321312 is an equidigital number, since it uses as much as digits as its factorization.

1201321312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615502 (or 615494 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1201321312 is about 34660.0824003637. The cubic root of 1201321312 is about 1063.0484548728.

Adding to 1201321312 its reverse (2131231021), we get a palindrome (3332552333).

The spelling of 1201321312 in words is "one billion, two hundred one million, three hundred twenty-one thousand, three hundred twelve".