39991000505 has 4 divisors (see below), whose sum is σ = 47989200612. Its totient is φ = 31992800400.

The previous prime is 39991000501. The next prime is 39991000541. The reversal of 39991000505 is 50500019993.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7462713769 + 32528286736 = 86387^2 + 180356^2 .

It is not a de Polignac number, because 39991000505 - 2² = 39991000501 is a prime.

It is a super-3 number, since 3×39991000505³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39991000501) 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, 3999100046 + ... + 3999100055.

It is an arithmetic number, because the mean of its divisors is an integer number (11997300153).

Almost surely, 2^39991000505 is an apocalyptic number.

It is an amenable number.

39991000505 is a deficient number, since it is larger than the sum of its proper divisors (7998200107).

39991000505 is an equidigital number, since it uses as much as digits as its factorization.

39991000505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7998200106.

The product of its (nonzero) digits is 54675, while the sum is 41.

The spelling of 39991000505 in words is "thirty-nine billion, nine hundred ninety-one million, five hundred five", and thus it is an aban number.