222001261 has 4 divisors (see below), whose sum is σ = 229162624. Its totient is φ = 214839900.

The previous prime is 222001253. The next prime is 222001279. The reversal of 222001261 is 162100222.

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 222001261 - 2³ = 222001253 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 (222001201) 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, 3580635 + ... + 3580696.

It is an arithmetic number, because the mean of its divisors is an integer number (57290656).

Almost surely, 2^222001261 is an apocalyptic number.

It is an amenable number.

222001261 is a deficient number, since it is larger than the sum of its proper divisors (7161363).

222001261 is an equidigital number, since it uses as much as digits as its factorization.

222001261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7161362.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 222001261 is about 14899.7067420805. The cubic root of 222001261 is about 605.5060411079.

Adding to 222001261 its reverse (162100222), we get a palindrome (384101483).

The spelling of 222001261 in words is "two hundred twenty-two million, one thousand, two hundred sixty-one".