15115213523 has 4 divisors (see below), whose sum is σ = 15602801088. Its totient is φ = 14627625960.

The previous prime is 15115213517. The next prime is 15115213573. The reversal of 15115213523 is 32531251151.

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 15115213523 - 2¹² = 15115209427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15115213573) 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, 243793736 + ... + 243793797.

It is an arithmetic number, because the mean of its divisors is an integer number (3900700272).

Almost surely, 2^15115213523 is an apocalyptic number.

15115213523 is a deficient number, since it is larger than the sum of its proper divisors (487587565).

15115213523 is an equidigital number, since it uses as much as digits as its factorization.

15115213523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487587564.

The product of its digits is 4500, while the sum is 29.

Adding to 15115213523 its reverse (32531251151), we get a palindrome (47646464674).

The spelling of 15115213523 in words is "fifteen billion, one hundred fifteen million, two hundred thirteen thousand, five hundred twenty-three".