1221294653 has 2 divisors, whose sum is σ = 1221294654. Its totient is φ = 1221294652.

The previous prime is 1221294629. The next prime is 1221294677. The reversal of 1221294653 is 3564921221.

It is a balanced prime because it is at equal distance from previous prime (1221294629) and next prime (1221294677).

It can be written as a sum of positive squares in only one way, i.e., 990801529 + 230493124 = 31477^2 + 15182^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221294653 - 2⁶ = 1221294589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221294623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610647326 + 610647327.

It is an arithmetic number, because the mean of its divisors is an integer number (610647327).

Almost surely, 2^1221294653 is an apocalyptic number.

It is an amenable number.

1221294653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221294653 is an equidigital number, since it uses as much as digits as its factorization.

1221294653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 1221294653 is about 34947.0263827983. The cubic root of 1221294653 is about 1068.9075678995.

The spelling of 1221294653 in words is "one billion, two hundred twenty-one million, two hundred ninety-four thousand, six hundred fifty-three".