39991000501 has 2 divisors, whose sum is σ = 39991000502. Its totient is φ = 39991000500.

The previous prime is 39991000499. The next prime is 39991000541. The reversal of 39991000501 is 10500019993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30322998225 + 9668002276 = 174135^2 + 98326^2 .

It is a cyclic number.

It is not a de Polignac number, because 39991000501 - 2¹ = 39991000499 is a prime.

Together with 39991000499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39991000541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19995500250 + 19995500251.

It is an arithmetic number, because the mean of its divisors is an integer number (19995500251).

Almost surely, 2^39991000501 is an apocalyptic number.

It is an amenable number.

39991000501 is a deficient number, since it is larger than the sum of its proper divisors (1).

39991000501 is an equidigital number, since it uses as much as digits as its factorization.

39991000501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10935, while the sum is 37.

The spelling of 39991000501 in words is "thirty-nine billion, nine hundred ninety-one million, five hundred one", and thus it is an aban number.