222156145 has 4 divisors (see below), whose sum is σ = 266587380. Its totient is φ = 177724912.

The previous prime is 222156139. The next prime is 222156161. The reversal of 222156145 is 541651222.

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

It can be written as a sum of positive squares in 2 ways, for example, as 113912929 + 108243216 = 10673^2 + 10404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222156145 is a prime.

It is a super-2 number, since 2×222156145² = 98706705522522050, which contains 22 as substring.

It is an unprimeable number.

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, 22215610 + ... + 22215619.

It is an arithmetic number, because the mean of its divisors is an integer number (66646845).

Almost surely, 2^222156145 is an apocalyptic number.

It is an amenable number.

222156145 is a deficient number, since it is larger than the sum of its proper divisors (44431235).

222156145 is an equidigital number, since it uses as much as digits as its factorization.

222156145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44431234.

The product of its digits is 4800, while the sum is 28.

The square root of 222156145 is about 14904.9033878117. The cubic root of 222156145 is about 605.6468231854.

The spelling of 222156145 in words is "two hundred twenty-two million, one hundred fifty-six thousand, one hundred forty-five".