1225522211 has 4 divisors (see below), whose sum is σ = 1290023400. Its totient is φ = 1161021024.

The previous prime is 1225522201. The next prime is 1225522213. The reversal of 1225522211 is 1122255221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1122255221 = 17 ⋅66015013.

It is a cyclic number.

It is not a de Polignac number, because 1225522211 - 2¹⁸ = 1225260067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225522213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32250566 + ... + 32250603.

It is an arithmetic number, because the mean of its divisors is an integer number (322505850).

Almost surely, 2^1225522211 is an apocalyptic number.

1225522211 is a deficient number, since it is larger than the sum of its proper divisors (64501189).

1225522211 is an equidigital number, since it uses as much as digits as its factorization.

1225522211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64501188.

The product of its digits is 800, while the sum is 23.

The square root of 1225522211 is about 35007.4593622559. The cubic root of 1225522211 is about 1070.1395022936.

Adding to 1225522211 its reverse (1122255221), we get a palindrome (2347777432).

The spelling of 1225522211 in words is "one billion, two hundred twenty-five million, five hundred twenty-two thousand, two hundred eleven".