51312211 has 8 divisors (see below), whose sum is σ = 52214400. Its totient is φ = 50415552.

The previous prime is 51312187. The next prime is 51312221. The reversal of 51312211 is 11221315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51312211 - 2¹¹ = 51310163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51312221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20190 + ... + 22588.

It is an arithmetic number, because the mean of its divisors is an integer number (6526800).

Almost surely, 2^51312211 is an apocalyptic number.

51312211 is a deficient number, since it is larger than the sum of its proper divisors (902189).

51312211 is a wasteful number, since it uses less digits than its factorization.

51312211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2765.

The product of its digits is 60, while the sum is 16.

The square root of 51312211 is about 7163.2542185797. The cubic root of 51312211 is about 371.5981781966.

Adding to 51312211 its reverse (11221315), we get a palindrome (62533526).

The spelling of 51312211 in words is "fifty-one million, three hundred twelve thousand, two hundred eleven".