3947205161 has 2 divisors, whose sum is σ = 3947205162. Its totient is φ = 3947205160.

The previous prime is 3947205149. The next prime is 3947205203. The reversal of 3947205161 is 1615027493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2855299225 + 1091905936 = 53435^2 + 33044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3947205161 is a prime.

It is not a weakly prime, because it can be changed into another prime (3947205761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1973602580 + 1973602581.

It is an arithmetic number, because the mean of its divisors is an integer number (1973602581).

Almost surely, 2^3947205161 is an apocalyptic number.

It is an amenable number.

3947205161 is a deficient number, since it is larger than the sum of its proper divisors (1).

3947205161 is an equidigital number, since it uses as much as digits as its factorization.

3947205161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 3947205161 is about 62826.7869702088. The cubic root of 3947205161 is about 1580.3862166731.

The spelling of 3947205161 in words is "three billion, nine hundred forty-seven million, two hundred five thousand, one hundred sixty-one".