1681289608 has 8 divisors (see below), whose sum is σ = 3152418030. Its totient is φ = 840644800.

The previous prime is 1681289591. The next prime is 1681289629. The reversal of 1681289608 is 8069821861.

It can be written as a sum of positive squares in only one way, i.e., 1637173444 + 44116164 = 40462^2 + 6642^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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, 105080593 + ... + 105080608.

Almost surely, 2^1681289608 is an apocalyptic number.

It is an amenable number.

1681289608 is a deficient number, since it is larger than the sum of its proper divisors (1471128422).

1681289608 is a wasteful number, since it uses less digits than its factorization.

1681289608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210161207 (or 210161203 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 49.

The square root of 1681289608 is about 41003.5316527735. The cubic root of 1681289608 is about 1189.0884924881.

The spelling of 1681289608 in words is "one billion, six hundred eighty-one million, two hundred eighty-nine thousand, six hundred eight".