1155503513 has 4 divisors (see below), whose sum is σ = 1156813008. Its totient is φ = 1154194020.

The previous prime is 1155503501. The next prime is 1155503519. The reversal of 1155503513 is 3153055511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3153055511 = 16529 ⋅190759.

It is a cyclic number.

It is not a de Polignac number, because 1155503513 - 2⁸ = 1155503257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155503519) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 653423 + ... + 655188.

It is an arithmetic number, because the mean of its divisors is an integer number (289203252).

Almost surely, 2^1155503513 is an apocalyptic number.

It is an amenable number.

1155503513 is a deficient number, since it is larger than the sum of its proper divisors (1309495).

1155503513 is an equidigital number, since it uses as much as digits as its factorization.

1155503513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309494.

The product of its (nonzero) digits is 5625, while the sum is 29.

The square root of 1155503513 is about 33992.6979364686. The cubic root of 1155503513 is about 1049.3581906936.

The spelling of 1155503513 in words is "one billion, one hundred fifty-five million, five hundred three thousand, five hundred thirteen".