11215623523 has 4 divisors (see below), whose sum is σ = 12078363808. Its totient is φ = 10352883240.

The previous prime is 11215623439. The next prime is 11215623539. The reversal of 11215623523 is 32532651211.

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 11215623523 - 2⁹ = 11215623011 is a prime.

It is a super-2 number, since 2×11215623523² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11215623553) 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, 431370123 + ... + 431370148.

It is an arithmetic number, because the mean of its divisors is an integer number (3019590952).

Almost surely, 2^11215623523 is an apocalyptic number.

11215623523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11215623523 is a deficient number, since it is larger than the sum of its proper divisors (862740285).

11215623523 is an equidigital number, since it uses as much as digits as its factorization.

11215623523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862740284.

The product of its digits is 10800, while the sum is 31.

The spelling of 11215623523 in words is "eleven billion, two hundred fifteen million, six hundred twenty-three thousand, five hundred twenty-three".