3955906813 has 2 divisors, whose sum is σ = 3955906814. Its totient is φ = 3955906812.

The previous prime is 3955906793. The next prime is 3955906847. The reversal of 3955906813 is 3186095593.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3133536484 + 822370329 = 55978^2 + 28677^2 .

It is a cyclic number.

It is not a de Polignac number, because 3955906813 - 2²⁹ = 3419035901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3955906313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1977953406 + 1977953407.

It is an arithmetic number, because the mean of its divisors is an integer number (1977953407).

Almost surely, 2^3955906813 is an apocalyptic number.

It is an amenable number.

3955906813 is a deficient number, since it is larger than the sum of its proper divisors (1).

3955906813 is an equidigital number, since it uses as much as digits as its factorization.

3955906813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 874800, while the sum is 49.

The square root of 3955906813 is about 62895.9999761511. Note that the first 4 decimals coincide. The cubic root of 3955906813 is about 1581.5466899050.

The spelling of 3955906813 in words is "three billion, nine hundred fifty-five million, nine hundred six thousand, eight hundred thirteen".