213459989 has 2 divisors, whose sum is σ = 213459990. Its totient is φ = 213459988.

The previous prime is 213459979. The next prime is 213460019. The reversal of 213459989 is 989954312.

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., 131285764 + 82174225 = 11458^2 + 9065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213459989 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213459929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106729994 + 106729995.

It is an arithmetic number, because the mean of its divisors is an integer number (106729995).

Almost surely, 2^213459989 is an apocalyptic number.

It is an amenable number.

213459989 is a deficient number, since it is larger than the sum of its proper divisors (1).

213459989 is an equidigital number, since it uses as much as digits as its factorization.

213459989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 50.

The square root of 213459989 is about 14610.2699838162. The cubic root of 213459989 is about 597.6388585026.

The spelling of 213459989 in words is "two hundred thirteen million, four hundred fifty-nine thousand, nine hundred eighty-nine".