3925780813 has 2 divisors, whose sum is σ = 3925780814. Its totient is φ = 3925780812.

The previous prime is 3925780801. The next prime is 3925780853. The reversal of 3925780813 is 3180875293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3274357284 + 651423529 = 57222^2 + 25523^2 .

It is an emirp because it is prime and its reverse (3180875293) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3925780813 - 2²¹ = 3923683661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3925780853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1962890406 + 1962890407.

It is an arithmetic number, because the mean of its divisors is an integer number (1962890407).

Almost surely, 2^3925780813 is an apocalyptic number.

It is an amenable number.

3925780813 is a deficient number, since it is larger than the sum of its proper divisors (1).

3925780813 is an equidigital number, since it uses as much as digits as its factorization.

3925780813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 3925780813 is about 62656.0516869680. The cubic root of 3925780813 is about 1577.5217267408.

The spelling of 3925780813 in words is "three billion, nine hundred twenty-five million, seven hundred eighty thousand, eight hundred thirteen".