51643222 has 4 divisors (see below), whose sum is σ = 77464836. Its totient is φ = 25821610.

The previous prime is 51643217. The next prime is 51643223. The reversal of 51643222 is 22234615.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51643223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12910804 + ... + 12910807.

It is an arithmetic number, because the mean of its divisors is an integer number (19366209).

Almost surely, 2^51643222 is an apocalyptic number.

51643222 is a deficient number, since it is larger than the sum of its proper divisors (25821614).

51643222 is a wasteful number, since it uses less digits than its factorization.

51643222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25821613.

The product of its digits is 2880, while the sum is 25.

The square root of 51643222 is about 7186.3218686613. The cubic root of 51643222 is about 372.3955162417.

Adding to 51643222 its reverse (22234615), we get a palindrome (73877837).

The spelling of 51643222 in words is "fifty-one million, six hundred forty-three thousand, two hundred twenty-two".