1220989727 has 2 divisors, whose sum is σ = 1220989728. Its totient is φ = 1220989726.

The previous prime is 1220989669. The next prime is 1220989741. The reversal of 1220989727 is 7279890221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220989727 - 2⁶ = 1220989663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220989127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610494863 + 610494864.

It is an arithmetic number, because the mean of its divisors is an integer number (610494864).

Almost surely, 2^1220989727 is an apocalyptic number.

1220989727 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220989727 is an equidigital number, since it uses as much as digits as its factorization.

1220989727 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 1220989727 is about 34942.6634216684. The cubic root of 1220989727 is about 1068.8186008791.

The spelling of 1220989727 in words is "one billion, two hundred twenty million, nine hundred eighty-nine thousand, seven hundred twenty-seven".