1231126560 has 384 divisors, whose sum is σ = 4615833600. Its totient is φ = 305786880.

The previous prime is 1231126549. The next prime is 1231126579. The reversal of 1231126560 is 656211321.

1231126560 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 1 + 2 + 656 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3883522 + ... + 3883838.

It is an arithmetic number, because the mean of its divisors is an integer number (12020400).

Almost surely, 2^1231126560 is an apocalyptic number.

1231126560 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 1231126560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2307916800).

1231126560 is an abundant number, since it is smaller than the sum of its proper divisors (3384707040).

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

1231126560 is a wasteful number, since it uses less digits than its factorization.

1231126560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1231126560 is about 35087.4131277870. The cubic root of 1231126560 is about 1071.7682817648.

Adding to 1231126560 its reverse (656211321), we get a palindrome (1887337881).

The spelling of 1231126560 in words is "one billion, two hundred thirty-one million, one hundred twenty-six thousand, five hundred sixty".