1181221069 has 8 divisors (see below), whose sum is σ = 1396517760. Its totient is φ = 977562096.

The previous prime is 1181221049. The next prime is 1181221073. The reversal of 1181221069 is 9601221811.

It is a happy number.

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

It is not a de Polignac number, because 1181221069 - 2⁵ = 1181221037 is a prime.

It is a super-2 number, since 2×1181221069² = 2790566427699005522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1181221069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181221009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2909209 + ... + 2909614.

It is an arithmetic number, because the mean of its divisors is an integer number (174564720).

Almost surely, 2^1181221069 is an apocalyptic number.

It is an amenable number.

1181221069 is a deficient number, since it is larger than the sum of its proper divisors (215296691).

1181221069 is an equidigital number, since it uses as much as digits as its factorization.

1181221069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5818859.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 1181221069 is about 34368.8968254729. The cubic root of 1181221069 is about 1057.0861796695.

The spelling of 1181221069 in words is "one billion, one hundred eighty-one million, two hundred twenty-one thousand, sixty-nine".