1228108581 has 16 divisors (see below), whose sum is σ = 2079337600. Its totient is φ = 701776224.

The previous prime is 1228108573. The next prime is 1228108589. The reversal of 1228108581 is 1858018221.

It is an interprime number because it is at equal distance from previous prime (1228108573) and next prime (1228108589).

It is not a de Polignac number, because 1228108581 - 2³ = 1228108573 is a prime.

It is a super-2 number, since 2×1228108581² = 3016501373451667122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228108589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3248776 + ... + 3249153.

It is an arithmetic number, because the mean of its divisors is an integer number (129958600).

Almost surely, 2^1228108581 is an apocalyptic number.

It is an amenable number.

1228108581 is a deficient number, since it is larger than the sum of its proper divisors (851229019).

1228108581 is an equidigital number, since it uses as much as digits as its factorization.

1228108581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6497945 (or 6497939 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 36.

The square root of 1228108581 is about 35044.3801628735. The cubic root of 1228108581 is about 1070.8917889242.

The spelling of 1228108581 in words is "one billion, two hundred twenty-eight million, one hundred eight thousand, five hundred eighty-one".