39919556806841 has 2 divisors, whose sum is σ = 39919556806842. Its totient is φ = 39919556806840.

The previous prime is 39919556806819. The next prime is 39919556806919. The reversal of 39919556806841 is 14860865591993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32013360061225 + 7906196745616 = 5658035^2 + 2811796^2 .

It is an emirp because it is prime and its reverse (14860865591993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39919556806841 is a prime.

It is not a weakly prime, because it can be changed into another prime (39919556806141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19959778403420 + 19959778403421.

It is an arithmetic number, because the mean of its divisors is an integer number (19959778403421).

Almost surely, 2^{39919556806841} is an apocalyptic number.

It is an amenable number.

39919556806841 is a deficient number, since it is larger than the sum of its proper divisors (1).

39919556806841 is an equidigital number, since it uses as much as digits as its factorization.

39919556806841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 503884800, while the sum is 74.

The spelling of 39919556806841 in words is "thirty-nine trillion, nine hundred nineteen billion, five hundred fifty-six million, eight hundred six thousand, eight hundred forty-one".