11172003523 has 4 divisors (see below), whose sum is σ = 11172262408. Its totient is φ = 11171744640.

The previous prime is 11172003511. The next prime is 11172003559. The reversal of 11172003523 is 32530027111.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11172003523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11172003023) 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, 47361 + ... + 156802.

It is an arithmetic number, because the mean of its divisors is an integer number (2793065602).

Almost surely, 2^11172003523 is an apocalyptic number.

11172003523 is a deficient number, since it is larger than the sum of its proper divisors (258885).

11172003523 is an equidigital number, since it uses as much as digits as its factorization.

11172003523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258884.

The product of its (nonzero) digits is 1260, while the sum is 25.

The spelling of 11172003523 in words is "eleven billion, one hundred seventy-two million, three thousand, five hundred twenty-three".