1131244420 has 96 divisors (see below), whose sum is σ = 2647572480. Its totient is φ = 404046720.

The previous prime is 1131244417. The next prime is 1131244421. The reversal of 1131244420 is 244421311.

It is a happy number.

It is a super-2 number, since 2×1131244420² = 2559427875562272800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1131244391 and 1131244400.

It is not an unprimeable number, because it can be changed into a prime (1131244421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 619629 + ... + 621451.

It is an arithmetic number, because the mean of its divisors is an integer number (27578880).

Almost surely, 2^1131244420 is an apocalyptic number.

1131244420 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 1131244420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1323786240).

1131244420 is an abundant number, since it is smaller than the sum of its proper divisors (1516328060).

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

1131244420 is a wasteful number, since it uses less digits than its factorization.

1131244420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1945 (or 1943 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1131244420 is about 33633.9771659553. The cubic root of 1131244420 is about 1041.9626461608.

Adding to 1131244420 its reverse (244421311), we get a palindrome (1375665731).

The spelling of 1131244420 in words is "one billion, one hundred thirty-one million, two hundred forty-four thousand, four hundred twenty".