1201135220 has 12 divisors (see below), whose sum is σ = 2522384004. Its totient is φ = 480454080.

The previous prime is 1201135219. The next prime is 1201135223. The reversal of 1201135220 is 225311021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 226321936 + 974813284 = 15044^2 + 31222^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201135223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30028361 + ... + 30028400.

It is an arithmetic number, because the mean of its divisors is an integer number (210198667).

Almost surely, 2^1201135220 is an apocalyptic number.

1201135220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201135220 is an abundant number, since it is smaller than the sum of its proper divisors (1321248784).

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

1201135220 is a wasteful number, since it uses less digits than its factorization.

1201135220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60056770 (or 60056768 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1201135220 is about 34657.3977672877. The cubic root of 1201135220 is about 1062.9935611413.

Adding to 1201135220 its reverse (225311021), we get a palindrome (1426446241).

The spelling of 1201135220 in words is "one billion, two hundred one million, one hundred thirty-five thousand, two hundred twenty".