1131220450 has 24 divisors (see below), whose sum is σ = 2113360272. Its totient is φ = 450490320.

The previous prime is 1131220397. The next prime is 1131220457. The reversal of 1131220450 is 540221311.

It is not an unprimeable number, because it can be changed into a prime (1131220457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38484 + ... + 61183.

It is an arithmetic number, because the mean of its divisors is an integer number (88056678).

Almost surely, 2^1131220450 is an apocalyptic number.

1131220450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1131220450 is a deficient number, since it is larger than the sum of its proper divisors (982139822).

1131220450 is a wasteful number, since it uses less digits than its factorization.

1131220450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99906 (or 99901 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1131220450 is about 33633.6208279751. The cubic root of 1131220450 is about 1041.9552867076.

Adding to 1131220450 its reverse (540221311), we get a palindrome (1671441761).

The spelling of 1131220450 in words is "one billion, one hundred thirty-one million, two hundred twenty thousand, four hundred fifty".