1155536513 has 4 divisors (see below), whose sum is σ = 1156219140. Its totient is φ = 1154853888.

The previous prime is 1155536489. The next prime is 1155536521. The reversal of 1155536513 is 3156355511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3156355511 = 127 ⋅24853193.

It can be written as a sum of positive squares in 2 ways, for example, as 1122451009 + 33085504 = 33503^2 + 5752^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155536513 - 2¹⁴ = 1155520129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1155536533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338768 + ... + 342161.

It is an arithmetic number, because the mean of its divisors is an integer number (289054785).

Almost surely, 2^1155536513 is an apocalyptic number.

It is an amenable number.

1155536513 is a deficient number, since it is larger than the sum of its proper divisors (682627).

1155536513 is an equidigital number, since it uses as much as digits as its factorization.

1155536513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682626.

The product of its digits is 33750, while the sum is 35.

The square root of 1155536513 is about 33993.1833313681. The cubic root of 1155536513 is about 1049.3681801311.

The spelling of 1155536513 in words is "one billion, one hundred fifty-five million, five hundred thirty-six thousand, five hundred thirteen".