1228355549 has 4 divisors (see below), whose sum is σ = 1281762336. Its totient is φ = 1174948764.

The previous prime is 1228355543. The next prime is 1228355561. The reversal of 1228355549 is 9455538221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1228355549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228355543) 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, 26703359 + ... + 26703404.

It is an arithmetic number, because the mean of its divisors is an integer number (320440584).

Almost surely, 2^1228355549 is an apocalyptic number.

It is an amenable number.

1228355549 is a deficient number, since it is larger than the sum of its proper divisors (53406787).

1228355549 is an equidigital number, since it uses as much as digits as its factorization.

1228355549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53406786.

The product of its digits is 432000, while the sum is 44.

The square root of 1228355549 is about 35047.9036320291. The cubic root of 1228355549 is about 1070.9635682117.

The spelling of 1228355549 in words is "one billion, two hundred twenty-eight million, three hundred fifty-five thousand, five hundred forty-nine".