1221032287 has 2 divisors, whose sum is σ = 1221032288. Its totient is φ = 1221032286.

The previous prime is 1221032261. The next prime is 1221032291. The reversal of 1221032287 is 7822301221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221032287 - 2¹⁹ = 1220507999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221032297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610516143 + 610516144.

It is an arithmetic number, because the mean of its divisors is an integer number (610516144).

Almost surely, 2^1221032287 is an apocalyptic number.

1221032287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221032287 is an equidigital number, since it uses as much as digits as its factorization.

1221032287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1221032287 is about 34943.2724140141. The cubic root of 1221032287 is about 1068.8310193268.

The spelling of 1221032287 in words is "one billion, two hundred twenty-one million, thirty-two thousand, two hundred eighty-seven".