1209675681 has 24 divisors (see below), whose sum is σ = 1903743840. Its totient is φ = 759007296.

The previous prime is 1209675631. The next prime is 1209675713. The reversal of 1209675681 is 1865769021.

1209675681 is a `hidden beast` number, since 1 + 20 + 9 + 67 + 568 + 1 = 666.

It is not a de Polignac number, because 1209675681 - 2⁶ = 1209675617 is a prime.

It is a super-2 number, since 2×1209675681² = 2926630506405627522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1209675611) 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 in 23 ways as a sum of consecutive naturals, for example, 69711 + ... + 85316.

It is an arithmetic number, because the mean of its divisors is an integer number (79322660).

Almost surely, 2^1209675681 is an apocalyptic number.

It is an amenable number.

1209675681 is a deficient number, since it is larger than the sum of its proper divisors (694068159).

1209675681 is a wasteful number, since it uses less digits than its factorization.

1209675681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155070 (or 155047 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 1209675681 is about 34780.3921915783. The cubic root of 1209675681 is about 1065.5070230109.

The spelling of 1209675681 in words is "one billion, two hundred nine million, six hundred seventy-five thousand, six hundred eighty-one".