2551222 has 4 divisors (see below), whose sum is σ = 3826836. Its totient is φ = 1275610.

The previous prime is 2551177. The next prime is 2551223. The reversal of 2551222 is 2221552.

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

It is a plaindrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 2551222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637804 + ... + 637807.

It is an arithmetic number, because the mean of its divisors is an integer number (956709).

2^2551222 is an apocalyptic number.

2551222 is a deficient number, since it is larger than the sum of its proper divisors (1275614).

2551222 is a wasteful number, since it uses less digits than its factorization.

2551222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275613.

The product of its digits is 400, while the sum is 19.

The square root of 2551222 is about 1597.2545194802. The cubic root of 2551222 is about 136.6415407574.

Adding to 2551222 its reverse (2221552), we get a palindrome (4772774).

The spelling of 2551222 in words is "two million, five hundred fifty-one thousand, two hundred twenty-two".