1201231120 has 80 divisors (see below), whose sum is σ = 2985558912. Its totient is φ = 448363520.

The previous prime is 1201231117. The next prime is 1201231153. The reversal of 1201231120 is 211321021.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 1201231120.

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 15 ways as a sum of consecutive naturals, for example, 67479 + ... + 83401.

Almost surely, 2^1201231120 is an apocalyptic number.

1201231120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201231120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1492779456).

1201231120 is an abundant number, since it is smaller than the sum of its proper divisors (1784327792).

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

1201231120 is a wasteful number, since it uses less digits than its factorization.

1201231120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16000 (or 15994 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1201231120 is about 34658.7812826706. The cubic root of 1201231120 is about 1063.0218505928.

Adding to 1201231120 its reverse (211321021), we get a palindrome (1412552141).

The spelling of 1201231120 in words is "one billion, two hundred one million, two hundred thirty-one thousand, one hundred twenty".