51103213 has 4 divisors (see below), whose sum is σ = 58403680. Its totient is φ = 43802748.

The previous prime is 51103201. The next prime is 51103237. The reversal of 51103213 is 31230115.

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 51103213 - 2⁵ = 51103181 is a prime.

It is a super-2 number, since 2×51103213² = 5223076757846738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51103243) 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, 3650223 + ... + 3650236.

It is an arithmetic number, because the mean of its divisors is an integer number (14600920).

Almost surely, 2^51103213 is an apocalyptic number.

It is an amenable number.

51103213 is a deficient number, since it is larger than the sum of its proper divisors (7300467).

51103213 is an equidigital number, since it uses as much as digits as its factorization.

51103213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7300466.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 51103213 is about 7148.6511315073. The cubic root of 51103213 is about 371.0929770868.

Adding to 51103213 its reverse (31230115), we get a palindrome (82333328).

The spelling of 51103213 in words is "fifty-one million, one hundred three thousand, two hundred thirteen".