1131223256 has 8 divisors (see below), whose sum is σ = 2121043620. Its totient is φ = 565611624.

The previous prime is 1131223253. The next prime is 1131223297. The reversal of 1131223256 is 6523221311.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131223253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70701446 + ... + 70701461.

Almost surely, 2^1131223256 is an apocalyptic number.

It is an amenable number.

1131223256 is a deficient number, since it is larger than the sum of its proper divisors (989820364).

1131223256 is a wasteful number, since it uses less digits than its factorization.

1131223256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141402913 (or 141402909 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 1131223256 is about 33633.6625421615. The cubic root of 1131223256 is about 1041.9561482326.

Adding to 1131223256 its reverse (6523221311), we get a palindrome (7654444567).

The spelling of 1131223256 in words is "one billion, one hundred thirty-one million, two hundred twenty-three thousand, two hundred fifty-six".