3939417661 has 2 divisors, whose sum is σ = 3939417662. Its totient is φ = 3939417660.

The previous prime is 3939417653. The next prime is 3939417683. The reversal of 3939417661 is 1667149393.

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., 3551564025 + 387853636 = 59595^2 + 19694^2 .

It is a cyclic number.

It is not a de Polignac number, because 3939417661 - 2³ = 3939417653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3939411661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1969708830 + 1969708831.

It is an arithmetic number, because the mean of its divisors is an integer number (1969708831).

Almost surely, 2^3939417661 is an apocalyptic number.

It is an amenable number.

3939417661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3939417661 is an equidigital number, since it uses as much as digits as its factorization.

3939417661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 49.

The square root of 3939417661 is about 62764.7804186392. The cubic root of 3939417661 is about 1579.3462099032.

The spelling of 3939417661 in words is "three billion, nine hundred thirty-nine million, four hundred seventeen thousand, six hundred sixty-one".