3979857961 has 2 divisors, whose sum is σ = 3979857962. Its totient is φ = 3979857960.

The previous prime is 3979857943. The next prime is 3979857967. The reversal of 3979857961 is 1697589793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3514118400 + 465739561 = 59280^2 + 21581^2 .

It is an emirp because it is prime and its reverse (1697589793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3979857961 - 2²⁷ = 3845640233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3979857893 and 3979857902.

It is not a weakly prime, because it can be changed into another prime (3979857967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989928980 + 1989928981.

It is an arithmetic number, because the mean of its divisors is an integer number (1989928981).

Almost surely, 2^3979857961 is an apocalyptic number.

It is an amenable number.

3979857961 is a deficient number, since it is larger than the sum of its proper divisors (1).

3979857961 is an equidigital number, since it uses as much as digits as its factorization.

3979857961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25719120, while the sum is 64.

The square root of 3979857961 is about 63086.1154375509. The cubic root of 3979857961 is about 1584.7321092889.

The spelling of 3979857961 in words is "three billion, nine hundred seventy-nine million, eight hundred fifty-seven thousand, nine hundred sixty-one".