11503131 has 4 divisors (see below), whose sum is σ = 15337512. Its totient is φ = 7668752.

The previous prime is 11503103. The next prime is 11503153. The reversal of 11503131 is 13130511.

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

It is a cyclic number.

It is not a de Polignac number, because 11503131 - 2⁵ = 11503099 is a prime.

It is a super-2 number, since 2×11503131² = 264644045606322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11503131.

It is not an unprimeable number, because it can be changed into a prime (11503181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1917186 + ... + 1917191.

It is an arithmetic number, because the mean of its divisors is an integer number (3834378).

Almost surely, 2^11503131 is an apocalyptic number.

11503131 is a deficient number, since it is larger than the sum of its proper divisors (3834381).

11503131 is an equidigital number, since it uses as much as digits as its factorization.

11503131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3834380.

The product of its (nonzero) digits is 45, while the sum is 15.

The square root of 11503131 is about 3391.6266009100. The cubic root of 11503131 is about 225.7383546296.

Adding to 11503131 its reverse (13130511), we get a palindrome (24633642).

The spelling of 11503131 in words is "eleven million, five hundred three thousand, one hundred thirty-one".