3918621571049 has 2 divisors, whose sum is σ = 3918621571050. Its totient is φ = 3918621571048.

The previous prime is 3918621571037. The next prime is 3918621571099. The reversal of 3918621571049 is 9401751268193.

It is a happy number.

3918621571049 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2602920809449 + 1315700761600 = 1613357^2 + 1147040^2 .

It is an emirp because it is prime and its reverse (9401751268193) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3918621571049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3918621570985 and 3918621571003.

It is not a weakly prime, because it can be changed into another prime (3918621571099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1959310785524 + 1959310785525.

It is an arithmetic number, because the mean of its divisors is an integer number (1959310785525).

It is a 1-persistent number, because it is pandigital, but 2⋅3918621571049 = 7837243142098 is not.

Almost surely, 2^{3918621571049} is an apocalyptic number.

It is an amenable number.

3918621571049 is a deficient number, since it is larger than the sum of its proper divisors (1).

3918621571049 is an equidigital number, since it uses as much as digits as its factorization.

3918621571049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 56.

The spelling of 3918621571049 in words is "three trillion, nine hundred eighteen billion, six hundred twenty-one million, five hundred seventy-one thousand, forty-nine".