1226555100 has 108 divisors (see below), whose sum is σ = 4070770704. Its totient is φ = 307837440.

The previous prime is 1226555039. The next prime is 1226555101. The reversal of 1226555100 is 15556221.

1226555100 is a `hidden beast` number, since 1 + 2 + 2 + 6 + 555 + 100 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226555101) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 24784 + ... + 55383.

Almost surely, 2^1226555100 is an apocalyptic number.

1226555100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1226555100 is an abundant number, since it is smaller than the sum of its proper divisors (2844215604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1226555100 is a wasteful number, since it uses less digits than its factorization.

1226555100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80204 (or 80194 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 1226555100 is about 35022.2086682151. The cubic root of 1226555100 is about 1070.4400612239.

The spelling of 1226555100 in words is "one billion, two hundred twenty-six million, five hundred fifty-five thousand, one hundred".