213259809 has 12 divisors (see below), whose sum is σ = 330770544. Its totient is φ = 121862664.

The previous prime is 213259793. The next prime is 213259829. The reversal of 213259809 is 908952312.

It is not a de Polignac number, because 213259809 - 2⁴ = 213259793 is a prime.

It is a super-2 number, since 2×213259809² = 90959492269432962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213259829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 725227 + ... + 725520.

It is an arithmetic number, because the mean of its divisors is an integer number (27564212).

Almost surely, 2^213259809 is an apocalyptic number.

It is an amenable number.

213259809 is a deficient number, since it is larger than the sum of its proper divisors (117510735).

213259809 is a wasteful number, since it uses less digits than its factorization.

213259809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450764 (or 1450757 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 213259809 is about 14603.4177164115. The cubic root of 213259809 is about 597.4519807584.

The spelling of 213259809 in words is "two hundred thirteen million, two hundred fifty-nine thousand, eight hundred nine".