1206605261 has 16 divisors (see below), whose sum is σ = 1266092208. Its totient is φ = 1148659200.

The previous prime is 1206605251. The next prime is 1206605263. The reversal of 1206605261 is 1625066021.

It can be written as a sum of positive squares in 8 ways, for example, as 255808036 + 950797225 = 15994^2 + 30835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1206605261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206605263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1021091 + ... + 1022271.

It is an arithmetic number, because the mean of its divisors is an integer number (79130763).

Almost surely, 2^1206605261 is an apocalyptic number.

It is an amenable number.

1206605261 is a deficient number, since it is larger than the sum of its proper divisors (59486947).

1206605261 is a wasteful number, since it uses less digits than its factorization.

1206605261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1206605261 is about 34736.2240463756. The cubic root of 1206605261 is about 1064.6047630066.

The spelling of 1206605261 in words is "one billion, two hundred six million, six hundred five thousand, two hundred sixty-one".