1221303287 has 2 divisors, whose sum is σ = 1221303288. Its totient is φ = 1221303286.

The previous prime is 1221303277. The next prime is 1221303313. The reversal of 1221303287 is 7823031221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221303287 - 2⁴ = 1221303271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221303227) 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 as a sum of consecutive naturals, namely, 610651643 + 610651644.

It is an arithmetic number, because the mean of its divisors is an integer number (610651644).

Almost surely, 2^1221303287 is an apocalyptic number.

1221303287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221303287 is an equidigital number, since it uses as much as digits as its factorization.

1221303287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1221303287 is about 34947.1499124034. The cubic root of 1221303287 is about 1068.9100867910.

The spelling of 1221303287 in words is "one billion, two hundred twenty-one million, three hundred three thousand, two hundred eighty-seven".