213454909 has 2 divisors, whose sum is σ = 213454910. Its totient is φ = 213454908.

The previous prime is 213454889. The next prime is 213454939. The reversal of 213454909 is 909454312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213452100 + 2809 = 14610^2 + 53^2 .

It is a cyclic number.

It is not a de Polignac number, because 213454909 - 2¹¹ = 213452861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213454939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106727454 + 106727455.

It is an arithmetic number, because the mean of its divisors is an integer number (106727455).

Almost surely, 2^213454909 is an apocalyptic number.

It is an amenable number.

213454909 is a deficient number, since it is larger than the sum of its proper divisors (1).

213454909 is an equidigital number, since it uses as much as digits as its factorization.

213454909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 213454909 is about 14610.0961324695. The cubic root of 213454909 is about 597.6341175213.

The spelling of 213454909 in words is "two hundred thirteen million, four hundred fifty-four thousand, nine hundred nine".