15239921513 has 4 divisors (see below), whose sum is σ = 15333418128. Its totient is φ = 15146424900.

The previous prime is 15239921491. The next prime is 15239921533. The reversal of 15239921513 is 31512993251.

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: 31512993251 = 149 ⋅211496599.

It is a cyclic number.

It is not a de Polignac number, because 15239921513 - 2⁶ = 15239921449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15239921533) 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, 46748063 + ... + 46748388.

It is an arithmetic number, because the mean of its divisors is an integer number (3833354532).

Almost surely, 2^15239921513 is an apocalyptic number.

It is an amenable number.

15239921513 is a deficient number, since it is larger than the sum of its proper divisors (93496615).

15239921513 is an equidigital number, since it uses as much as digits as its factorization.

15239921513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93496614.

The product of its digits is 72900, while the sum is 41.

The spelling of 15239921513 in words is "fifteen billion, two hundred thirty-nine million, nine hundred twenty-one thousand, five hundred thirteen".