213433457 has 4 divisors (see below), whose sum is σ = 213481380. Its totient is φ = 213385536.

The previous prime is 213433433. The next prime is 213433469. The reversal of 213433457 is 754334312.

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 25441936 + 187991521 = 5044^2 + 13711^2 .

It is a cyclic number.

It is not a de Polignac number, because 213433457 - 2¹² = 213429361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213463457) 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, 16508 + ... + 26445.

It is an arithmetic number, because the mean of its divisors is an integer number (53370345).

Almost surely, 2^213433457 is an apocalyptic number.

It is an amenable number.

213433457 is a deficient number, since it is larger than the sum of its proper divisors (47923).

213433457 is an equidigital number, since it uses as much as digits as its factorization.

213433457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47922.

The product of its digits is 30240, while the sum is 32.

The square root of 213433457 is about 14609.3619641653. The cubic root of 213433457 is about 597.6140963114.

Adding to 213433457 its reverse (754334312), we get a palindrome (967767769).

The spelling of 213433457 in words is "two hundred thirteen million, four hundred thirty-three thousand, four hundred fifty-seven".