213632461 has 4 divisors (see below), whose sum is σ = 244151392. Its totient is φ = 183113532.

The previous prime is 213632459. The next prime is 213632467. The reversal of 213632461 is 164236312.

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 not a de Polignac number, because 213632461 - 2¹ = 213632459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213632467) 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, 15259455 + ... + 15259468.

It is an arithmetic number, because the mean of its divisors is an integer number (61037848).

Almost surely, 2^213632461 is an apocalyptic number.

It is an amenable number.

213632461 is a deficient number, since it is larger than the sum of its proper divisors (30518931).

213632461 is an equidigital number, since it uses as much as digits as its factorization.

213632461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30518930.

The product of its digits is 5184, while the sum is 28.

The square root of 213632461 is about 14616.1712154723. The cubic root of 213632461 is about 597.7997758107.

Adding to 213632461 its reverse (164236312), we get a palindrome (377868773).

The spelling of 213632461 in words is "two hundred thirteen million, six hundred thirty-two thousand, four hundred sixty-one".