222720751 has 4 divisors (see below), whose sum is σ = 242968104. Its totient is φ = 202473400.

The previous prime is 222720749. The next prime is 222720767. The reversal of 222720751 is 157027222.

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

It is a cyclic number.

It is not a de Polignac number, because 222720751 - 2¹ = 222720749 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 (222720721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10123660 + ... + 10123681.

It is an arithmetic number, because the mean of its divisors is an integer number (60742026).

Almost surely, 2^222720751 is an apocalyptic number.

222720751 is a deficient number, since it is larger than the sum of its proper divisors (20247353).

222720751 is a wasteful number, since it uses less digits than its factorization.

222720751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20247352.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 222720751 is about 14923.8316460619. The cubic root of 222720751 is about 606.1594694450.

Adding to 222720751 its reverse (157027222), we get a palindrome (379747973).

The spelling of 222720751 in words is "two hundred twenty-two million, seven hundred twenty thousand, seven hundred fifty-one".