222145501 has 2 divisors, whose sum is σ = 222145502. Its totient is φ = 222145500.

The previous prime is 222145499. The next prime is 222145519. The reversal of 222145501 is 105541222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194044900 + 28100601 = 13930^2 + 5301^2 .

It is a cyclic number.

It is not a de Polignac number, because 222145501 - 2¹ = 222145499 is a prime.

It is a super-2 number, since 2×222145501² = 98697247229082002, which contains 22 as substring.

Together with 222145499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222145531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111072750 + 111072751.

It is an arithmetic number, because the mean of its divisors is an integer number (111072751).

Almost surely, 2^222145501 is an apocalyptic number.

It is an amenable number.

222145501 is a deficient number, since it is larger than the sum of its proper divisors (1).

222145501 is an equidigital number, since it uses as much as digits as its factorization.

222145501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 222145501 is about 14904.5463198314. The cubic root of 222145501 is about 605.6371503976.

Adding to 222145501 its reverse (105541222), we get a palindrome (327686723).

The spelling of 222145501 in words is "two hundred twenty-two million, one hundred forty-five thousand, five hundred one".