1135513561 has 16 divisors (see below), whose sum is σ = 1427295744. Its totient is φ = 879309504.

The previous prime is 1135513543. The next prime is 1135513567. The reversal of 1135513561 is 1653155311.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1135513561 - 2¹¹ = 1135511513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1135513567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128470 + ... + 137023.

It is an arithmetic number, because the mean of its divisors is an integer number (89205984).

Almost surely, 2^1135513561 is an apocalyptic number.

It is an amenable number.

1135513561 is a deficient number, since it is larger than the sum of its proper divisors (291782183).

1135513561 is a wasteful number, since it uses less digits than its factorization.

1135513561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265560.

The product of its digits is 6750, while the sum is 31.

The square root of 1135513561 is about 33697.3821090007. The cubic root of 1135513561 is about 1043.2717359160.

Adding to 1135513561 its reverse (1653155311), we get a palindrome (2788668872).

The spelling of 1135513561 in words is "one billion, one hundred thirty-five million, five hundred thirteen thousand, five hundred sixty-one".