51222263 has 4 divisors (see below), whose sum is σ = 51247680. Its totient is φ = 51196848.

The previous prime is 51222253. The next prime is 51222289. The reversal of 51222263 is 36222215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36222215 = 5 ⋅7244443.

It is a cyclic number.

It is not a de Polignac number, because 51222263 - 2⁴ = 51222247 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 (51222253) 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, 9398 + ... + 13811.

It is an arithmetic number, because the mean of its divisors is an integer number (12811920).

Almost surely, 2^51222263 is an apocalyptic number.

51222263 is a deficient number, since it is larger than the sum of its proper divisors (25417).

51222263 is a wasteful number, since it uses less digits than its factorization.

51222263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25416.

The product of its digits is 1440, while the sum is 23.

The square root of 51222263 is about 7156.9730333431. The cubic root of 51222263 is about 371.3809195631.

Adding to 51222263 its reverse (36222215), we get a palindrome (87444478).

The spelling of 51222263 in words is "fifty-one million, two hundred twenty-two thousand, two hundred sixty-three".