1201311120 has 80 divisors (see below), whose sum is σ = 3943140480. Its totient is φ = 301504512.

The previous prime is 1201311107. The next prime is 1201311121. The reversal of 1201311120 is 211131021.

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

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1201311096 and 1201311105.

It is not an unprimeable number, because it can be changed into a prime (1201311121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143140 + ... + 151299.

It is an arithmetic number, because the mean of its divisors is an integer number (49289256).

Almost surely, 2^1201311120 is an apocalyptic number.

1201311120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201311120 is an abundant number, since it is smaller than the sum of its proper divisors (2741829360).

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

1201311120 is a wasteful number, since it uses less digits than its factorization.

1201311120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294472 (or 294466 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1201311120 is about 34659.9353721267. The cubic root of 1201311120 is about 1063.0454485662.

Adding to 1201311120 its reverse (211131021), we get a palindrome (1412442141).

The spelling of 1201311120 in words is "one billion, two hundred one million, three hundred eleven thousand, one hundred twenty".