213348409 has 4 divisors (see below), whose sum is σ = 213434404. Its totient is φ = 213262416.

The previous prime is 213348371. The next prime is 213348433. The reversal of 213348409 is 904843312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39187600 + 174160809 = 6260^2 + 13197^2 .

It is a cyclic number.

It is not a de Polignac number, because 213348409 - 2⁷ = 213348281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213348449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39162 + ... + 44275.

It is an arithmetic number, because the mean of its divisors is an integer number (53358601).

Almost surely, 2^213348409 is an apocalyptic number.

It is an amenable number.

213348409 is a deficient number, since it is larger than the sum of its proper divisors (85995).

213348409 is an equidigital number, since it uses as much as digits as its factorization.

213348409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85994.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 213348409 is about 14606.4509378562. The cubic root of 213348409 is about 597.5347075770.

The spelling of 213348409 in words is "two hundred thirteen million, three hundred forty-eight thousand, four hundred nine".