1200661169 has 2 divisors, whose sum is σ = 1200661170. Its totient is φ = 1200661168.

The previous prime is 1200661141. The next prime is 1200661181. The reversal of 1200661169 is 9611660021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 960256144 + 240405025 = 30988^2 + 15505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200661169 - 2¹⁶ = 1200595633 is a prime.

It is a super-2 number, since 2×1200661169² = 2883174485488893122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1200663169) 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, 600330584 + 600330585.

It is an arithmetic number, because the mean of its divisors is an integer number (600330585).

Almost surely, 2^1200661169 is an apocalyptic number.

It is an amenable number.

1200661169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200661169 is an equidigital number, since it uses as much as digits as its factorization.

1200661169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1200661169 is about 34650.5579897352. The cubic root of 1200661169 is about 1062.8536991563.

The spelling of 1200661169 in words is "one billion, two hundred million, six hundred sixty-one thousand, one hundred sixty-nine".