1131220340 has 48 divisors (see below), whose sum is σ = 2479513680. Its totient is φ = 433105920.

The previous prime is 1131220333. The next prime is 1131220357. The reversal of 1131220340 is 430221311.

It can be written as a sum of positive squares in 8 ways, for example, as 289408144 + 841812196 = 17012^2 + 29014^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30446 + ... + 56474.

It is an arithmetic number, because the mean of its divisors is an integer number (51656535).

Almost surely, 2^1131220340 is an apocalyptic number.

1131220340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1131220340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1239756840).

1131220340 is an abundant number, since it is smaller than the sum of its proper divisors (1348293340).

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

1131220340 is a wasteful number, since it uses less digits than its factorization.

1131220340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26132 (or 26130 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1131220340 is about 33633.6191927066. The cubic root of 1131220340 is about 1041.9552529343.

Adding to 1131220340 its reverse (430221311), we get a palindrome (1561441651).

The spelling of 1131220340 in words is "one billion, one hundred thirty-one million, two hundred twenty thousand, three hundred forty".