15240609809 has 2 divisors, whose sum is σ = 15240609810. Its totient is φ = 15240609808.

The previous prime is 15240609719. The next prime is 15240609817. The reversal of 15240609809 is 90890604251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8663886400 + 6576723409 = 93080^2 + 81097^2 .

It is a cyclic number.

It is not a de Polignac number, because 15240609809 - 2¹⁶ = 15240544273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15240609809.

It is not a weakly prime, because it can be changed into another prime (15240609829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7620304904 + 7620304905.

It is an arithmetic number, because the mean of its divisors is an integer number (7620304905).

Almost surely, 2^15240609809 is an apocalyptic number.

It is an amenable number.

15240609809 is a deficient number, since it is larger than the sum of its proper divisors (1).

15240609809 is an equidigital number, since it uses as much as digits as its factorization.

15240609809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 15240609809 in words is "fifteen billion, two hundred forty million, six hundred nine thousand, eight hundred nine".