1208859661 has 2 divisors, whose sum is σ = 1208859662. Its totient is φ = 1208859660.

The previous prime is 1208859637. The next prime is 1208859679. The reversal of 1208859661 is 1669588021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 755425225 + 453434436 = 27485^2 + 21294^2 .

It is a cyclic number.

It is not a de Polignac number, because 1208859661 - 2¹⁷ = 1208728589 is a prime.

It is a super-2 number, since 2×1208859661² = 2922683359986069842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1208859611) 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, 604429830 + 604429831.

It is an arithmetic number, because the mean of its divisors is an integer number (604429831).

Almost surely, 2^1208859661 is an apocalyptic number.

It is an amenable number.

1208859661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1208859661 is an equidigital number, since it uses as much as digits as its factorization.

1208859661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 1208859661 is about 34768.6591774834. The cubic root of 1208859661 is about 1065.2673800947.

The spelling of 1208859661 in words is "one billion, two hundred eight million, eight hundred fifty-nine thousand, six hundred sixty-one".