1135521240 has 128 divisors (see below), whose sum is σ = 3988293120. Its totient is φ = 253209600.

The previous prime is 1135521217. The next prime is 1135521251. The reversal of 1135521240 is 421255311.

It is a happy number.

It is a super-2 number, since 2×1135521240² = 2578816972982275200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1135521240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17955 + ... + 50925.

It is an arithmetic number, because the mean of its divisors is an integer number (31158540).

Almost surely, 2^1135521240 is an apocalyptic number.

1135521240 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 1135521240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1994146560).

1135521240 is an abundant number, since it is smaller than the sum of its proper divisors (2852771880).

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

1135521240 is a wasteful number, since it uses less digits than its factorization.

1135521240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33033 (or 33029 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1135521240 is about 33697.4960494100. The cubic root of 1135521240 is about 1043.2740876464.

Adding to 1135521240 its reverse (421255311), we get a palindrome (1556776551).

The spelling of 1135521240 in words is "one billion, one hundred thirty-five million, five hundred twenty-one thousand, two hundred forty".