1226555243 has 4 divisors (see below), whose sum is σ = 1246662768. Its totient is φ = 1206447720.

The previous prime is 1226555237. The next prime is 1226555249. The reversal of 1226555243 is 3425556221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3425556221 = 23 ⋅148937227.

It is an interprime number because it is at equal distance from previous prime (1226555237) and next prime (1226555249).

It is a cyclic number.

It is not a de Polignac number, because 1226555243 - 2⁶ = 1226555179 is a prime.

It is a super-3 number, since 3×1226555243³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226555249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10053671 + ... + 10053792.

It is an arithmetic number, because the mean of its divisors is an integer number (311665692).

Almost surely, 2^1226555243 is an apocalyptic number.

1226555243 is a deficient number, since it is larger than the sum of its proper divisors (20107525).

1226555243 is an equidigital number, since it uses as much as digits as its factorization.

1226555243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20107524.

The product of its digits is 72000, while the sum is 35.

The square root of 1226555243 is about 35022.2107097767. The cubic root of 1226555243 is about 1070.4401028236.

The spelling of 1226555243 in words is "one billion, two hundred twenty-six million, five hundred fifty-five thousand, two hundred forty-three".