39971517099 has 4 divisors (see below), whose sum is σ = 53295356136. Its totient is φ = 26647678064.

The previous prime is 39971517097. The next prime is 39971517137. The reversal of 39971517099 is 99071517993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39971517099 - 2¹ = 39971517097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39971517097) 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, 6661919514 + ... + 6661919519.

It is an arithmetic number, because the mean of its divisors is an integer number (13323839034).

Almost surely, 2^39971517099 is an apocalyptic number.

39971517099 is a deficient number, since it is larger than the sum of its proper divisors (13323839037).

39971517099 is a wasteful number, since it uses less digits than its factorization.

39971517099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13323839036.

The product of its (nonzero) digits is 4822335, while the sum is 60.

The spelling of 39971517099 in words is "thirty-nine billion, nine hundred seventy-one million, five hundred seventeen thousand, ninety-nine".