15217323249 has 4 divisors (see below), whose sum is σ = 20289764336. Its totient is φ = 10144882164.

The previous prime is 15217323223. The next prime is 15217323311. The reversal of 15217323249 is 94232371251.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94232371251 = 3 ⋅31410790417.

It is not a de Polignac number, because 15217323249 - 2⁵ = 15217323217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15217328249) 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, 2536220539 + ... + 2536220544.

It is an arithmetic number, because the mean of its divisors is an integer number (5072441084).

Almost surely, 2^15217323249 is an apocalyptic number.

It is an amenable number.

15217323249 is a deficient number, since it is larger than the sum of its proper divisors (5072441087).

15217323249 is an equidigital number, since it uses as much as digits as its factorization.

15217323249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5072441086.

The product of its digits is 90720, while the sum is 39.

The spelling of 15217323249 in words is "fifteen billion, two hundred seventeen million, three hundred twenty-three thousand, two hundred forty-nine".