1201541220 has 72 divisors (see below), whose sum is σ = 3976015680. Its totient is φ = 291282240.

The previous prime is 1201541213. The next prime is 1201541221. The reversal of 1201541220 is 221451021.

1201541220 is a `hidden beast` number, since 120 + 1 + 541 + 2 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1201541193 and 1201541202.

It is not an unprimeable number, because it can be changed into a prime (1201541221) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 301440 + ... + 305399.

It is an arithmetic number, because the mean of its divisors is an integer number (55222440).

Almost surely, 2^1201541220 is an apocalyptic number.

1201541220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201541220 is an abundant number, since it is smaller than the sum of its proper divisors (2774474460).

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

1201541220 is a wasteful number, since it uses less digits than its factorization.

1201541220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606865 (or 606860 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1201541220 is about 34663.2546077255. The cubic root of 1201541220 is about 1063.1133163977.

Adding to 1201541220 its reverse (221451021), we get a palindrome (1422992241).

It can be divided in two parts, 12015 and 41220, that added together give a palindrome (53235).

The spelling of 1201541220 in words is "one billion, two hundred one million, five hundred forty-one thousand, two hundred twenty".