3949685161 has 2 divisors, whose sum is σ = 3949685162. Its totient is φ = 3949685160.

The previous prime is 3949685137. The next prime is 3949685171. The reversal of 3949685161 is 1615869493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3243985936 + 705699225 = 56956^2 + 26565^2 .

It is a cyclic number.

It is not a de Polignac number, because 3949685161 - 2²¹ = 3947588009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3949685099 and 3949685108.

It is not a weakly prime, because it can be changed into another prime (3949685101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1974842580 + 1974842581.

It is an arithmetic number, because the mean of its divisors is an integer number (1974842581).

Almost surely, 2^3949685161 is an apocalyptic number.

It is an amenable number.

3949685161 is a deficient number, since it is larger than the sum of its proper divisors (1).

3949685161 is an equidigital number, since it uses as much as digits as its factorization.

3949685161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 52.

The square root of 3949685161 is about 62846.5206753723. The cubic root of 3949685161 is about 1580.7171290621.

The spelling of 3949685161 in words is "three billion, nine hundred forty-nine million, six hundred eighty-five thousand, one hundred sixty-one".