1155540013 has 4 divisors (see below), whose sum is σ = 1157543260. Its totient is φ = 1153536768.

The previous prime is 1155540011. The next prime is 1155540037. The reversal of 1155540013 is 3100455511.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1105030564 + 50509449 = 33242^2 + 7107^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155540013 - 2¹ = 1155540011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155540013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155540011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1000758 + ... + 1001911.

It is an arithmetic number, because the mean of its divisors is an integer number (289385815).

Almost surely, 2^1155540013 is an apocalyptic number.

It is an amenable number.

1155540013 is a deficient number, since it is larger than the sum of its proper divisors (2003247).

1155540013 is an equidigital number, since it uses as much as digits as its factorization.

1155540013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2003246.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 1155540013 is about 33993.2348122387. The cubic root of 1155540013 is about 1049.3692396058.

Adding to 1155540013 its reverse (3100455511), we get a palindrome (4255995524).

The spelling of 1155540013 in words is "one billion, one hundred fifty-five million, five hundred forty thousand, thirteen".