1220012291 has 2 divisors, whose sum is σ = 1220012292. Its totient is φ = 1220012290.

The previous prime is 1220012273. The next prime is 1220012329. The reversal of 1220012291 is 1922100221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220012291 - 2¹⁰ = 1220011267 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220012221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610006145 + 610006146.

It is an arithmetic number, because the mean of its divisors is an integer number (610006146).

Almost surely, 2^1220012291 is an apocalyptic number.

1220012291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220012291 is an equidigital number, since it uses as much as digits as its factorization.

1220012291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1220012291 is about 34928.6743378560. The cubic root of 1220012291 is about 1068.5333184699.

The spelling of 1220012291 in words is "one billion, two hundred twenty million, twelve thousand, two hundred ninety-one".