1226543603 has 4 divisors (see below), whose sum is σ = 1268838240. Its totient is φ = 1184248968.

The previous prime is 1226543597. The next prime is 1226543629. The reversal of 1226543603 is 3063456221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1226543603 - 2⁴ = 1226543587 is a prime.

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 1226543603.

It is not an unprimeable number, because it can be changed into a prime (1226543663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21147275 + ... + 21147332.

It is an arithmetic number, because the mean of its divisors is an integer number (317209560).

Almost surely, 2^1226543603 is an apocalyptic number.

1226543603 is a deficient number, since it is larger than the sum of its proper divisors (42294637).

1226543603 is an equidigital number, since it uses as much as digits as its factorization.

1226543603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42294636.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 1226543603 is about 35022.0445291248. The cubic root of 1226543603 is about 1070.4367166567.

Adding to 1226543603 its reverse (3063456221), we get a palindrome (4289999824).

The spelling of 1226543603 in words is "one billion, two hundred twenty-six million, five hundred forty-three thousand, six hundred three".