222135261 has 4 divisors (see below), whose sum is σ = 296180352. Its totient is φ = 148090172.

The previous prime is 222135247. The next prime is 222135269. The reversal of 222135261 is 162531222.

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 222135261 - 2⁵ = 222135229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222135269) 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, 37022541 + ... + 37022546.

It is an arithmetic number, because the mean of its divisors is an integer number (74045088).

Almost surely, 2^222135261 is an apocalyptic number.

It is an amenable number.

222135261 is a deficient number, since it is larger than the sum of its proper divisors (74045091).

222135261 is an equidigital number, since it uses as much as digits as its factorization.

222135261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74045090.

The product of its digits is 1440, while the sum is 24.

The square root of 222135261 is about 14904.2027965269. The cubic root of 222135261 is about 605.6278444552.

Adding to 222135261 its reverse (162531222), we get a palindrome (384666483).

The spelling of 222135261 in words is "two hundred twenty-two million, one hundred thirty-five thousand, two hundred sixty-one".