1213224181 has 8 divisors (see below), whose sum is σ = 1327968824. Its totient is φ = 1101539520.

The previous prime is 1213224167. The next prime is 1213224203. The reversal of 1213224181 is 1814223121.

It can be written as a sum of positive squares in 4 ways, for example, as 443556 + 1212780625 = 666^2 + 34825^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213224181 - 2⁷ = 1213224053 is a prime.

It is a super-2 number, since 2×1213224181² = 2943825826726241522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213224281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 764166 + ... + 765751.

It is an arithmetic number, because the mean of its divisors is an integer number (165996103).

Almost surely, 2^1213224181 is an apocalyptic number.

It is an amenable number.

1213224181 is a deficient number, since it is larger than the sum of its proper divisors (114744643).

1213224181 is a wasteful number, since it uses less digits than its factorization.

1213224181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529991.

The product of its digits is 768, while the sum is 25.

The square root of 1213224181 is about 34831.3677738902. The cubic root of 1213224181 is about 1066.5478696583.

The spelling of 1213224181 in words is "one billion, two hundred thirteen million, two hundred twenty-four thousand, one hundred eighty-one".