1145241220 has 12 divisors (see below), whose sum is σ = 2405006604. Its totient is φ = 458096480.

The previous prime is 1145241217. The next prime is 1145241257. The reversal of 1145241220 is 221425411.

It can be written as a sum of positive squares in 2 ways, for example, as 253382724 + 891858496 = 15918^2 + 29864^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1145241191 and 1145241200.

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 3 ways as a sum of consecutive naturals, for example, 28631011 + ... + 28631050.

It is an arithmetic number, because the mean of its divisors is an integer number (200417217).

Almost surely, 2^1145241220 is an apocalyptic number.

1145241220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1145241220 is an abundant number, since it is smaller than the sum of its proper divisors (1259765384).

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

1145241220 is a wasteful number, since it uses less digits than its factorization.

1145241220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57262070 (or 57262068 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1145241220 is about 33841.4127955675. The cubic root of 1145241220 is about 1046.2424177987.

Adding to 1145241220 its reverse (221425411), we get a palindrome (1366666631).

The spelling of 1145241220 in words is "one billion, one hundred forty-five million, two hundred forty-one thousand, two hundred twenty".