213343649 has 4 divisors (see below), whose sum is σ = 213535764. Its totient is φ = 213151536.

The previous prime is 213343621. The next prime is 213343681. The reversal of 213343649 is 946343312.

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 54760000 + 158583649 = 7400^2 + 12593^2 .

It is a cyclic number.

It is not a de Polignac number, because 213343649 - 2⁸ = 213343393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213343619) 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, 94382 + ... + 96615.

It is an arithmetic number, because the mean of its divisors is an integer number (53383941).

Almost surely, 2^213343649 is an apocalyptic number.

It is an amenable number.

213343649 is a deficient number, since it is larger than the sum of its proper divisors (192115).

213343649 is a wasteful number, since it uses less digits than its factorization.

213343649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192114.

The product of its digits is 46656, while the sum is 35.

The square root of 213343649 is about 14606.2879952437. The cubic root of 213343649 is about 597.5302636936.

The spelling of 213343649 in words is "two hundred thirteen million, three hundred forty-three thousand, six hundred forty-nine".