3890404561 has 2 divisors, whose sum is σ = 3890404562. Its totient is φ = 3890404560.

The previous prime is 3890404543. The next prime is 3890404571. The reversal of 3890404561 is 1654040983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3717218961 + 173185600 = 60969^2 + 13160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3890404561 is a prime.

It is not a weakly prime, because it can be changed into another prime (3890404501) 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, 1945202280 + 1945202281.

It is an arithmetic number, because the mean of its divisors is an integer number (1945202281).

Almost surely, 2^3890404561 is an apocalyptic number.

It is an amenable number.

3890404561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3890404561 is an equidigital number, since it uses as much as digits as its factorization.

3890404561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 3890404561 is about 62373.1076747022. The cubic root of 3890404561 is about 1572.7689329182.

The spelling of 3890404561 in words is "three billion, eight hundred ninety million, four hundred four thousand, five hundred sixty-one".