51222311 has 16 divisors (see below), whose sum is σ = 61959168. Its totient is φ = 41395200.

The previous prime is 51222299. The next prime is 51222317. The reversal of 51222311 is 11322215.

It is a happy number.

It is not a de Polignac number, because 51222311 - 2⁶ = 51222247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51222311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51222317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9191 + ... + 13671.

It is an arithmetic number, because the mean of its divisors is an integer number (3872448).

Almost surely, 2^51222311 is an apocalyptic number.

51222311 is a deficient number, since it is larger than the sum of its proper divisors (10736857).

51222311 is a wasteful number, since it uses less digits than its factorization.

51222311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4582.

The product of its digits is 120, while the sum is 17.

The square root of 51222311 is about 7156.9763867153. The cubic root of 51222311 is about 371.3810355691.

Adding to 51222311 its reverse (11322215), we get a palindrome (62544526).

The spelling of 51222311 in words is "fifty-one million, two hundred twenty-two thousand, three hundred eleven".