222287521 has 4 divisors (see below), whose sum is σ = 223618752. Its totient is φ = 220956292.

The previous prime is 222287509. The next prime is 222287531. The reversal of 222287521 is 125782222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 222287521 - 2⁵ = 222287489 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222287531) 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, 665365 + ... + 665698.

It is an arithmetic number, because the mean of its divisors is an integer number (55904688).

Almost surely, 2^222287521 is an apocalyptic number.

It is an amenable number.

222287521 is a deficient number, since it is larger than the sum of its proper divisors (1331231).

222287521 is a wasteful number, since it uses less digits than its factorization.

222287521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331230.

The product of its digits is 8960, while the sum is 31.

The square root of 222287521 is about 14909.3098767180. The cubic root of 222287521 is about 605.7661863442.

The spelling of 222287521 in words is "two hundred twenty-two million, two hundred eighty-seven thousand, five hundred twenty-one".