1131356520 has 192 divisors, whose sum is σ = 4423536000. Its totient is φ = 244975104.

The previous prime is 1131356491. The next prime is 1131356521. The reversal of 1131356520 is 256531311.

1131356520 is a `hidden beast` number, since 1 + 1 + 3 + 1 + 3 + 5 + 652 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (1131356521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36066 + ... + 59694.

It is an arithmetic number, because the mean of its divisors is an integer number (23039250).

Almost surely, 2^1131356520 is an apocalyptic number.

1131356520 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 1131356520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2211768000).

1131356520 is an abundant number, since it is smaller than the sum of its proper divisors (3292179480).

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

1131356520 is a wasteful number, since it uses less digits than its factorization.

1131356520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23672 (or 23665 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 1131356520 is about 33635.6435942588. The cubic root of 1131356520 is about 1041.9970625824.

Adding to 1131356520 its reverse (256531311), we get a palindrome (1387887831).

The spelling of 1131356520 in words is "one billion, one hundred thirty-one million, three hundred fifty-six thousand, five hundred twenty".