1206522161 has 8 divisors (see below), whose sum is σ = 1299672360. Its totient is φ = 1113420672.

The previous prime is 1206522143. The next prime is 1206522167. The reversal of 1206522161 is 1612256021.

It can be written as a sum of positive squares in 4 ways, for example, as 177395761 + 1029126400 = 13319^2 + 32080^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1206522161 - 2³⁰ = 132780337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1206522161.

It is not an unprimeable number, because it can be changed into a prime (1206522167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51725 + ... + 71333.

It is an arithmetic number, because the mean of its divisors is an integer number (162459045).

Almost surely, 2^1206522161 is an apocalyptic number.

It is an amenable number.

1206522161 is a deficient number, since it is larger than the sum of its proper divisors (93150199).

1206522161 is a wasteful number, since it uses less digits than its factorization.

1206522161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24355.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1206522161 is about 34735.0278681333. The cubic root of 1206522161 is about 1064.5803223466.

Adding to 1206522161 its reverse (1612256021), we get a palindrome (2818778182).

The spelling of 1206522161 in words is "one billion, two hundred six million, five hundred twenty-two thousand, one hundred sixty-one".