3842890661 has 2 divisors, whose sum is σ = 3842890662. Its totient is φ = 3842890660.

The previous prime is 3842890651. The next prime is 3842890673. The reversal of 3842890661 is 1660982483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3832848100 + 10042561 = 61910^2 + 3169^2 .

It is a cyclic number.

It is not a de Polignac number, because 3842890661 - 2¹⁰ = 3842889637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3842890651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1921445330 + 1921445331.

It is an arithmetic number, because the mean of its divisors is an integer number (1921445331).

Almost surely, 2^3842890661 is an apocalyptic number.

It is an amenable number.

3842890661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3842890661 is an equidigital number, since it uses as much as digits as its factorization.

3842890661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 3842890661 is about 61991.0530721974. The cubic root of 3842890661 is about 1566.3398938559.

The spelling of 3842890661 in words is "three billion, eight hundred forty-two million, eight hundred ninety thousand, six hundred sixty-one".