213544649 has 8 divisors (see below), whose sum is σ = 220719048. Its totient is φ = 206444160.

The previous prime is 213544621. The next prime is 213544679. The reversal of 213544649 is 946445312.

It can be written as a sum of positive squares in 4 ways, for example, as 5031049 + 208513600 = 2243^2 + 14440^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213544649 - 2⁸ = 213544393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213544609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12572 + ... + 24189.

It is an arithmetic number, because the mean of its divisors is an integer number (27589881).

Almost surely, 2^213544649 is an apocalyptic number.

It is an amenable number.

213544649 is a deficient number, since it is larger than the sum of its proper divisors (7174399).

213544649 is a wasteful number, since it uses less digits than its factorization.

213544649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36955.

The product of its digits is 103680, while the sum is 38.

The square root of 213544649 is about 14613.1669736577. The cubic root of 213544649 is about 597.7178575671.

The spelling of 213544649 in words is "two hundred thirteen million, five hundred forty-four thousand, six hundred forty-nine".