1211507226 has 16 divisors (see below), whose sum is σ = 2692238400. Its totient is φ = 403835724.

The previous prime is 1211507177. The next prime is 1211507233. The reversal of 1211507226 is 6227051121.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1211507226.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11217606 + ... + 11217713.

It is an arithmetic number, because the mean of its divisors is an integer number (168264900).

Almost surely, 2^1211507226 is an apocalyptic number.

1211507226 is an abundant number, since it is smaller than the sum of its proper divisors (1480731174).

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

1211507226 is a wasteful number, since it uses less digits than its factorization.

1211507226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22435330 (or 22435324 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 1211507226 is about 34806.7123698864. The cubic root of 1211507226 is about 1066.0445059076.

Adding to 1211507226 its reverse (6227051121), we get a palindrome (7438558347).

The spelling of 1211507226 in words is "one billion, two hundred eleven million, five hundred seven thousand, two hundred twenty-six".