51211313 has 4 divisors (see below), whose sum is σ = 51345408. Its totient is φ = 51077220.

The previous prime is 51211273. The next prime is 51211319. The reversal of 51211313 is 31311215.

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 51211313 - 2¹² = 51207217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51211291 and 51211300.

It is not an unprimeable number, because it can be changed into a prime (51211319) 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, 66473 + ... + 67238.

It is an arithmetic number, because the mean of its divisors is an integer number (12836352).

Almost surely, 2^51211313 is an apocalyptic number.

It is an amenable number.

51211313 is a deficient number, since it is larger than the sum of its proper divisors (134095).

51211313 is a wasteful number, since it uses less digits than its factorization.

51211313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134094.

The product of its digits is 90, while the sum is 17.

The square root of 51211313 is about 7156.2080042436. The cubic root of 51211313 is about 371.3544537866.

Adding to 51211313 its reverse (31311215), we get a palindrome (82522528).

The spelling of 51211313 in words is "fifty-one million, two hundred eleven thousand, three hundred thirteen".