212491589 has 2 divisors, whose sum is σ = 212491590. Its totient is φ = 212491588.

The previous prime is 212491553. The next prime is 212491651. The reversal of 212491589 is 985194212.

212491589 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154579489 + 57912100 = 12433^2 + 7610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212491589 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 (212490589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106245794 + 106245795.

It is an arithmetic number, because the mean of its divisors is an integer number (106245795).

Almost surely, 2^212491589 is an apocalyptic number.

It is an amenable number.

212491589 is a deficient number, since it is larger than the sum of its proper divisors (1).

212491589 is an equidigital number, since it uses as much as digits as its factorization.

212491589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 212491589 is about 14577.0912393385. The cubic root of 212491589 is about 596.7337226150.

The spelling of 212491589 in words is "two hundred twelve million, four hundred ninety-one thousand, five hundred eighty-nine".