11503111261 has 8 divisors (see below), whose sum is σ = 11979639000. Its totient is φ = 11031908160.

The previous prime is 11503111247. The next prime is 11503111267. The reversal of 11503111261 is 16211130511.

It can be written as a sum of positive squares in 4 ways, for example, as 31416025 + 11471695236 = 5605^2 + 107106^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11503111261 - 2⁷ = 11503111133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11503111267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1326750 + ... + 1335391.

It is an arithmetic number, because the mean of its divisors is an integer number (1497454875).

Almost surely, 2^11503111261 is an apocalyptic number.

It is an amenable number.

11503111261 is a deficient number, since it is larger than the sum of its proper divisors (476527739).

11503111261 is a wasteful number, since it uses less digits than its factorization.

11503111261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662319.

The product of its (nonzero) digits is 180, while the sum is 22.

Adding to 11503111261 its reverse (16211130511), we get a palindrome (27714241772).

The spelling of 11503111261 in words is "eleven billion, five hundred three million, one hundred eleven thousand, two hundred sixty-one".