213631441 has 4 divisors (see below), whose sum is σ = 214093312. Its totient is φ = 213169572.

The previous prime is 213631423. The next prime is 213631489. The reversal of 213631441 is 144136312.

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 213631441 - 2⁹ = 213630929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213631141) 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, 230241 + ... + 231166.

It is an arithmetic number, because the mean of its divisors is an integer number (53523328).

Almost surely, 2^213631441 is an apocalyptic number.

It is an amenable number.

213631441 is a deficient number, since it is larger than the sum of its proper divisors (461871).

213631441 is an equidigital number, since it uses as much as digits as its factorization.

213631441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461870.

The product of its digits is 1728, while the sum is 25.

The square root of 213631441 is about 14616.1363225717. The cubic root of 213631441 is about 597.7988243998.

Adding to 213631441 its reverse (144136312), we get a palindrome (357767753).

The spelling of 213631441 in words is "two hundred thirteen million, six hundred thirty-one thousand, four hundred forty-one".