1209703681 has 2 divisors, whose sum is σ = 1209703682. Its totient is φ = 1209703680.

The previous prime is 1209703643. The next prime is 1209703757. The reversal of 1209703681 is 1863079021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1080108225 + 129595456 = 32865^2 + 11384^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209703681 - 2⁷ = 1209703553 is a prime.

It is a super-2 number, since 2×1209703681² = 2926765991649899522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1209703681.

It is not a weakly prime, because it can be changed into another prime (1209701681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604851840 + 604851841.

It is an arithmetic number, because the mean of its divisors is an integer number (604851841).

Almost surely, 2^1209703681 is an apocalyptic number.

It is an amenable number.

1209703681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209703681 is an equidigital number, since it uses as much as digits as its factorization.

1209703681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 1209703681 is about 34780.7947148998. The cubic root of 1209703681 is about 1065.5152439379.

The spelling of 1209703681 in words is "one billion, two hundred nine million, seven hundred three thousand, six hundred eighty-one".