1206222661 has 6 divisors (see below), whose sum is σ = 1403157030. Its totient is φ = 1033905096.

The previous prime is 1206222653. The next prime is 1206222683. The reversal of 1206222661 is 1662226021.

It can be written as a sum of positive squares in only one way, i.e., 837813025 + 368409636 = 28945^2 + 19194^2 .

It is not a de Polignac number, because 1206222661 - 2³ = 1206222653 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 (1206222691) 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 5 ways as a sum of consecutive naturals, for example, 12308346 + ... + 12308443.

It is an arithmetic number, because the mean of its divisors is an integer number (233859505).

Almost surely, 2^1206222661 is an apocalyptic number.

It is an amenable number.

1206222661 is a deficient number, since it is larger than the sum of its proper divisors (196934369).

1206222661 is an equidigital number, since it uses as much as digits as its factorization.

1206222661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24616803 (or 24616796 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1206222661 is about 34730.7163905382. The cubic root of 1206222661 is about 1064.4922266605.

Adding to 1206222661 its reverse (1662226021), we get a palindrome (2868448682).

The spelling of 1206222661 in words is "one billion, two hundred six million, two hundred twenty-two thousand, six hundred sixty-one".