213394609 has 4 divisors (see below), whose sum is σ = 213454116. Its totient is φ = 213335104.

The previous prime is 213394583. The next prime is 213394613. The reversal of 213394609 is 906493312.

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 119246400 + 94148209 = 10920^2 + 9703^2 .

It is a cyclic number.

It is not a de Polignac number, because 213394609 - 2⁷ = 213394481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213394009) 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, 24004 + ... + 31669.

It is an arithmetic number, because the mean of its divisors is an integer number (53363529).

Almost surely, 2^213394609 is an apocalyptic number.

It is an amenable number.

213394609 is a deficient number, since it is larger than the sum of its proper divisors (59507).

213394609 is an equidigital number, since it uses as much as digits as its factorization.

213394609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59506.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 213394609 is about 14608.0323452544. The cubic root of 213394609 is about 597.5778359527.

The spelling of 213394609 in words is "two hundred thirteen million, three hundred ninety-four thousand, six hundred nine".