1131445400 has 48 divisors (see below), whose sum is σ = 2637554400. Its totient is φ = 451383680.

The previous prime is 1131445391. The next prime is 1131445423. The reversal of 1131445400 is 45441311.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70529 + ... + 85071.

It is an arithmetic number, because the mean of its divisors is an integer number (54949050).

Almost surely, 2^1131445400 is an apocalyptic number.

1131445400 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 1131445400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1318777200).

1131445400 is an abundant number, since it is smaller than the sum of its proper divisors (1506109000).

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

1131445400 is a wasteful number, since it uses less digits than its factorization.

1131445400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14948 (or 14939 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1131445400 is about 33636.9647857829. The cubic root of 1131445400 is about 1042.0243484916.

Adding to 1131445400 its reverse (45441311), we get a palindrome (1176886711).

The spelling of 1131445400 in words is "one billion, one hundred thirty-one million, four hundred forty-five thousand, four hundred".