1226491605 has 64 divisors (see below), whose sum is σ = 2315278080. Its totient is φ = 613896192.

The previous prime is 1226491579. The next prime is 1226491621. The reversal of 1226491605 is 5061946221.

1226491605 is a `hidden beast` number, since 1 + 2 + 2 + 6 + 49 + 1 + 605 = 666.

It is not a de Polignac number, because 1226491605 - 2⁹ = 1226491093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1226491605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1254877 + ... + 1255853.

It is an arithmetic number, because the mean of its divisors is an integer number (36176220).

Almost surely, 2^1226491605 is an apocalyptic number.

1226491605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1226491605 is a deficient number, since it is larger than the sum of its proper divisors (1088786475).

1226491605 is a wasteful number, since it uses less digits than its factorization.

1226491605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555 (or 1549 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1226491605 is about 35021.3021602567. The cubic root of 1226491605 is about 1070.4215897710.

The spelling of 1226491605 in words is "one billion, two hundred twenty-six million, four hundred ninety-one thousand, six hundred five".