1212989 has 2 divisors, whose sum is σ = 1212990. Its totient is φ = 1212988.

The previous prime is 1212973. The next prime is 1213007. The reversal of 1212989 is 9892121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 840889 + 372100 = 917^2 + 610^2 .

It is an emirp because it is prime and its reverse (9892121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212989 - 2⁴ = 1212973 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606494 + 606495.

It is an arithmetic number, because the mean of its divisors is an integer number (606495).

2^1212989 is an apocalyptic number.

It is an amenable number.

1212989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212989 is an equidigital number, since it uses as much as digits as its factorization.

1212989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 32.

The square root of 1212989 is about 1101.3577983562. The cubic root of 1212989 is about 106.6478949171.

The spelling of 1212989 in words is "one million, two hundred twelve thousand, nine hundred eighty-nine".