51322013 has 4 divisors (see below), whose sum is σ = 51343680. Its totient is φ = 51300348.

The previous prime is 51322009. The next prime is 51322049. The reversal of 51322013 is 31022315.

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 51322013 - 2² = 51322009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51321982 and 51322000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51322003) 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, 6773 + ... + 12186.

It is an arithmetic number, because the mean of its divisors is an integer number (12835920).

Almost surely, 2^51322013 is an apocalyptic number.

It is an amenable number.

51322013 is a deficient number, since it is larger than the sum of its proper divisors (21667).

51322013 is a wasteful number, since it uses less digits than its factorization.

51322013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21666.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 51322013 is about 7163.9383721526. The cubic root of 51322013 is about 371.6218384090.

Adding to 51322013 its reverse (31022315), we get a palindrome (82344328).

The spelling of 51322013 in words is "fifty-one million, three hundred twenty-two thousand, thirteen".