1228555181 has 8 divisors (see below), whose sum is σ = 1477961280. Its totient is φ = 997623648.

The previous prime is 1228555151. The next prime is 1228555183. The reversal of 1228555181 is 1815558221.

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

It is not a de Polignac number, because 1228555181 - 2⁶ = 1228555117 is a prime.

It is a super-2 number, since 2×1228555181² = 3018695665523885522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228555183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4618496 + ... + 4618761.

It is an arithmetic number, because the mean of its divisors is an integer number (184745160).

Almost surely, 2^1228555181 is an apocalyptic number.

It is an amenable number.

1228555181 is a deficient number, since it is larger than the sum of its proper divisors (249406099).

1228555181 is an equidigital number, since it uses as much as digits as its factorization.

1228555181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9237283.

The product of its digits is 32000, while the sum is 38.

The square root of 1228555181 is about 35050.7515040691. The cubic root of 1228555181 is about 1071.0215826355.

The spelling of 1228555181 in words is "one billion, two hundred twenty-eight million, five hundred fifty-five thousand, one hundred eighty-one".