1220120089 has 2 divisors, whose sum is σ = 1220120090. Its totient is φ = 1220120088.

The previous prime is 1220120081. The next prime is 1220120113. The reversal of 1220120089 is 9800210221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 807014464 + 413105625 = 28408^2 + 20325^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220120089 - 2³ = 1220120081 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220120081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610060044 + 610060045.

It is an arithmetic number, because the mean of its divisors is an integer number (610060045).

Almost surely, 2^1220120089 is an apocalyptic number.

It is an amenable number.

1220120089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220120089 is an equidigital number, since it uses as much as digits as its factorization.

1220120089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1220120089 is about 34930.2174198787. The cubic root of 1220120089 is about 1068.5647887436.

The spelling of 1220120089 in words is "one billion, two hundred twenty million, one hundred twenty thousand, eighty-nine".