39145809609 has 9 divisors (see below), whose sum is σ = 56544804589. Its totient is φ = 26096810700.

The previous prime is 39145809607. The next prime is 39145809613. The reversal of 39145809609 is 90690854193.

The square root of 39145809609 is 197853.

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

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

It is not a de Polignac number, because 39145809609 - 2¹ = 39145809607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39145809607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 560584 + ... + 626534.

Almost surely, 2^39145809609 is an apocalyptic number.

39145809609 is the 197853-rd square number.

39145809609 is the 98927-th centered octagonal number.

It is an amenable number.

39145809609 is a deficient number, since it is larger than the sum of its proper divisors (17398994980).

39145809609 is an frugal number, since it uses more digits than its factorization.

39145809609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131908 (or 65954 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 39145809609 in words is "thirty-nine billion, one hundred forty-five million, eight hundred nine thousand, six hundred nine".