1908581641 has 2 divisors, whose sum is σ = 1908581642. Its totient is φ = 1908581640.

The previous prime is 1908581629. The next prime is 1908581671. The reversal of 1908581641 is 1461858091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1241857600 + 666724041 = 35240^2 + 25821^2 .

It is a cyclic number.

It is not a de Polignac number, because 1908581641 - 2⁷ = 1908581513 is a prime.

It is not a weakly prime, because it can be changed into another prime (1908581621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954290820 + 954290821.

It is an arithmetic number, because the mean of its divisors is an integer number (954290821).

Almost surely, 2^1908581641 is an apocalyptic number.

It is an amenable number.

1908581641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1908581641 is an equidigital number, since it uses as much as digits as its factorization.

1908581641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 43.

The square root of 1908581641 is about 43687.3167063394. The cubic root of 1908581641 is about 1240.4242480433.

The spelling of 1908581641 in words is "one billion, nine hundred eight million, five hundred eighty-one thousand, six hundred forty-one".