213826649 has 4 divisors (see below), whose sum is σ = 214678800. Its totient is φ = 212974500.

The previous prime is 213826643. The next prime is 213826651. The reversal of 213826649 is 946628312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213826649 - 2¹⁶ = 213761113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213826643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425699 + ... + 426200.

It is an arithmetic number, because the mean of its divisors is an integer number (53669700).

Almost surely, 2^213826649 is an apocalyptic number.

It is an amenable number.

213826649 is a deficient number, since it is larger than the sum of its proper divisors (852151).

213826649 is an equidigital number, since it uses as much as digits as its factorization.

213826649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852150.

The product of its digits is 124416, while the sum is 41.

The square root of 213826649 is about 14622.8126227481. The cubic root of 213826649 is about 597.9808506450.

The spelling of 213826649 in words is "two hundred thirteen million, eight hundred twenty-six thousand, six hundred forty-nine".