1131422144 has 42 divisors (see below), whose sum is σ = 2283055632. Its totient is φ = 556320000.

The previous prime is 1131422119. The next prime is 1131422147. The reversal of 1131422144 is 4412241311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131422147) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 235769 + ... + 240519.

Almost surely, 2^1131422144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1131422144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1141527816).

1131422144 is an abundant number, since it is smaller than the sum of its proper divisors (1151633488).

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

1131422144 is an frugal number, since it uses more digits than its factorization.

1131422144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4885 (or 4814 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 1131422144 is about 33636.6190928874. The cubic root of 1131422144 is about 1042.0172091032.

Adding to 1131422144 its reverse (4412241311), we get a palindrome (5543663455).

The spelling of 1131422144 in words is "one billion, one hundred thirty-one million, four hundred twenty-two thousand, one hundred forty-four".