51335213 has 4 divisors (see below), whose sum is σ = 51864540. Its totient is φ = 50805888.

The previous prime is 51335203. The next prime is 51335237. The reversal of 51335213 is 31253315.

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 29833444 + 21501769 = 5462^2 + 4637^2 .

It is a cyclic number.

It is not a de Polignac number, because 51335213 - 2⁴ = 51335197 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 (51335203) 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, 264518 + ... + 264711.

It is an arithmetic number, because the mean of its divisors is an integer number (12966135).

Almost surely, 2^51335213 is an apocalyptic number.

It is an amenable number.

51335213 is a deficient number, since it is larger than the sum of its proper divisors (529327).

51335213 is an equidigital number, since it uses as much as digits as its factorization.

51335213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529326.

The product of its digits is 1350, while the sum is 23.

The square root of 51335213 is about 7164.8595938790. The cubic root of 51335213 is about 371.6536960044.

Adding to 51335213 its reverse (31253315), we get a palindrome (82588528).

The spelling of 51335213 in words is "fifty-one million, three hundred thirty-five thousand, two hundred thirteen".