1226100645 has 80 divisors (see below), whose sum is σ = 2740307328. Its totient is φ = 509535360.

The previous prime is 1226100593. The next prime is 1226100649. The reversal of 1226100645 is 5460016221.

1226100645 is a `hidden beast` number, since 1 + 2 + 2 + 6 + 10 + 0 + 645 = 666.

It is not a de Polignac number, because 1226100645 - 2¹³ = 1226092453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226100649) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 11527 + ... + 50843.

Almost surely, 2^1226100645 is an apocalyptic number.

1226100645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1226100645 is an abundant number, since it is smaller than the sum of its proper divisors (1514206683).

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

1226100645 is a wasteful number, since it uses less digits than its factorization.

1226100645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39352 (or 39343 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1226100645 is about 35015.7199697507. The cubic root of 1226100645 is about 1070.3078407931.

Adding to 1226100645 its reverse (5460016221), we get a palindrome (6686116866).

The spelling of 1226100645 in words is "one billion, two hundred twenty-six million, one hundred thousand, six hundred forty-five".