15323211523 has 4 divisors (see below), whose sum is σ = 16129696360. Its totient is φ = 14516726688.

The previous prime is 15323211509. The next prime is 15323211539. The reversal of 15323211523 is 32511232351.

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 15323211523 - 2¹³ = 15323203331 is a prime.

It is a super-2 number, since 2×15323211523² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15323211491 and 15323211500.

It is not an unprimeable number, because it can be changed into a prime (15323211503) 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, 403242390 + ... + 403242427.

It is an arithmetic number, because the mean of its divisors is an integer number (4032424090).

Almost surely, 2^15323211523 is an apocalyptic number.

15323211523 is a deficient number, since it is larger than the sum of its proper divisors (806484837).

15323211523 is an equidigital number, since it uses as much as digits as its factorization.

15323211523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806484836.

The product of its digits is 5400, while the sum is 28.

Adding to 15323211523 its reverse (32511232351), we get a palindrome (47834443874).

The spelling of 15323211523 in words is "fifteen billion, three hundred twenty-three million, two hundred eleven thousand, five hundred twenty-three".