3813507445421 has 2 divisors, whose sum is σ = 3813507445422. Its totient is φ = 3813507445420.

The previous prime is 3813507445411. The next prime is 3813507445483. The reversal of 3813507445421 is 1245447053183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2905698661321 + 907808784100 = 1704611^2 + 952790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3813507445421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3813507445411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1906753722710 + 1906753722711.

It is an arithmetic number, because the mean of its divisors is an integer number (1906753722711).

Almost surely, 2^{3813507445421} is an apocalyptic number.

It is an amenable number.

3813507445421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3813507445421 is an equidigital number, since it uses as much as digits as its factorization.

3813507445421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1612800, while the sum is 47.

The spelling of 3813507445421 in words is "three trillion, eight hundred thirteen billion, five hundred seven million, four hundred forty-five thousand, four hundred twenty-one".