15875244009 has 9 divisors (see below), whose sum is σ = 22931454013. Its totient is φ = 10583244012.

The previous prime is 15875244001. The next prime is 15875244017. The reversal of 15875244009 is 90044257851.

The square root of 15875244009 is 125997.

It is a perfect power (a square), and thus also a powerful number.

15875244009 is a `hidden beast` number, since 1 + 5 + 87 + 524 + 40 + 0 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (15875244001) and next prime (15875244017).

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 15875244009 - 2³ = 15875244001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15875244001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 356992 + ... + 398990.

Almost surely, 2^15875244009 is an apocalyptic number.

15875244009 is the 125997-th square number.

15875244009 is the 62999-th centered octagonal number.

It is an amenable number.

15875244009 is a deficient number, since it is larger than the sum of its proper divisors (7056210004).

15875244009 is an frugal number, since it uses more digits than its factorization.

15875244009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84004 (or 42002 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 15875244009 in words is "fifteen billion, eight hundred seventy-five million, two hundred forty-four thousand, nine".