1228537555 has 36 divisors (see below), whose sum is σ = 1821855888. Its totient is φ = 792825600.

The previous prime is 1228537553. The next prime is 1228537679. The reversal of 1228537555 is 5557358221.

It is not a de Polignac number, because 1228537555 - 2¹ = 1228537553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228537553) 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 35 ways as a sum of consecutive naturals, for example, 62130 + ... + 79480.

It is an arithmetic number, because the mean of its divisors is an integer number (50607108).

Almost surely, 2^1228537555 is an apocalyptic number.

1228537555 is a deficient number, since it is larger than the sum of its proper divisors (593318333).

1228537555 is a wasteful number, since it uses less digits than its factorization.

1228537555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17404 (or 17380 counting only the distinct ones).

The product of its digits is 420000, while the sum is 43.

The square root of 1228537555 is about 35050.5000677594. The cubic root of 1228537555 is about 1071.0164606524.

It can be divided in two parts, 122853755 and 5, that multiplied together give a triangular number (614268775 = T₃₅₀₅₀).

The spelling of 1228537555 in words is "one billion, two hundred twenty-eight million, five hundred thirty-seven thousand, five hundred fifty-five".