1131224644 has 72 divisors (see below), whose sum is σ = 2234645784. Its totient is φ = 500544000.

The previous prime is 1131224593. The next prime is 1131224657. The reversal of 1131224644 is 4464221311.

It can be written as a sum of positive squares in 4 ways, for example, as 210830400 + 920394244 = 14520^2 + 30338^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3568374 + ... + 3568690.

It is an arithmetic number, because the mean of its divisors is an integer number (31036747).

Almost surely, 2^1131224644 is an apocalyptic number.

It is an amenable number.

1131224644 is a deficient number, since it is larger than the sum of its proper divisors (1103421140).

1131224644 is a wasteful number, since it uses less digits than its factorization.

1131224644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 504 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 1131224644 is about 33633.6831762446. The cubic root of 1131224644 is about 1041.9565743891.

Adding to 1131224644 its reverse (4464221311), we get a palindrome (5595445955).

The spelling of 1131224644 in words is "one billion, one hundred thirty-one million, two hundred twenty-four thousand, six hundred forty-four".