1135523781 has 24 divisors (see below), whose sum is σ = 1909889280. Its totient is φ = 636626016.

The previous prime is 1135523773. The next prime is 1135523783. The reversal of 1135523781 is 1873255311.

It is a happy number.

It is not a de Polignac number, because 1135523781 - 2³ = 1135523773 is a prime.

It is a super-2 number, since 2×1135523781² = 2578828514433071922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1135523783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166701 + ... + 173378.

It is an arithmetic number, because the mean of its divisors is an integer number (79578720).

Almost surely, 2^1135523781 is an apocalyptic number.

It is an amenable number.

1135523781 is a deficient number, since it is larger than the sum of its proper divisors (774365499).

1135523781 is a wasteful number, since it uses less digits than its factorization.

1135523781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340145 (or 340142 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 1135523781 is about 33697.5337524870. The cubic root of 1135523781 is about 1043.2748658375.

The spelling of 1135523781 in words is "one billion, one hundred thirty-five million, five hundred twenty-three thousand, seven hundred eighty-one".