7122989 has 2 divisors, whose sum is σ = 7122990. Its totient is φ = 7122988.

The previous prime is 7122961. The next prime is 7123003. The reversal of 7122989 is 9892217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7022500 + 100489 = 2650^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 7122989 - 2⁸ = 7122733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7122289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3561494 + 3561495.

It is an arithmetic number, because the mean of its divisors is an integer number (3561495).

Almost surely, 2^7122989 is an apocalyptic number.

It is an amenable number.

7122989 is a deficient number, since it is larger than the sum of its proper divisors (1).

7122989 is an equidigital number, since it uses as much as digits as its factorization.

7122989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 38.

The square root of 7122989 is about 2668.8928416105. The cubic root of 7122989 is about 192.4069511509.

The spelling of 7122989 in words is "seven million, one hundred twenty-two thousand, nine hundred eighty-nine".