51830213 has 4 divisors (see below), whose sum is σ = 52560288. Its totient is φ = 51100140.

The previous prime is 51830209. The next prime is 51830231. The reversal of 51830213 is 31203815.

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 51830213 - 2² = 51830209 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 (51830243) 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, 364931 + ... + 365072.

It is an arithmetic number, because the mean of its divisors is an integer number (13140072).

Almost surely, 2^51830213 is an apocalyptic number.

It is an amenable number.

51830213 is a deficient number, since it is larger than the sum of its proper divisors (730075).

51830213 is an equidigital number, since it uses as much as digits as its factorization.

51830213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730074.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 51830213 is about 7199.3203151409. The cubic root of 51830213 is about 372.8444343576.

The spelling of 51830213 in words is "fifty-one million, eight hundred thirty thousand, two hundred thirteen".