1222661 has 8 divisors (see below), whose sum is σ = 1366848. Its totient is φ = 1084000.

The previous prime is 1222651. The next prime is 1222667. The reversal of 1222661 is 1662221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1222661 - 2⁶ = 1222597 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 (1222667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 905 + ... + 1806.

It is an arithmetic number, because the mean of its divisors is an integer number (170856).

2^1222661 is an apocalyptic number.

1222661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222661 is a deficient number, since it is larger than the sum of its proper divisors (144187).

1222661 is a wasteful number, since it uses less digits than its factorization.

1222661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2763.

The product of its digits is 288, while the sum is 20.

The square root of 1222661 is about 1105.7400236945. The cubic root of 1222661 is about 106.9306039671.

Adding to 1222661 its reverse (1662221), we get a palindrome (2884882).

The spelling of 1222661 in words is "one million, two hundred twenty-two thousand, six hundred sixty-one".